What part of the digestive system first causes chemical changes to food?
A. teeth in the mouth
B. saliva in the mouth
C. enzymes in the stomach
D. enzymes in the small intestine

Answer:

b. saliva in the mouth

Explanation:

saliva contains enzymes that help break down food

Saliva in the mouth causes the first chemical changes in the food. So the correct option is B.

Saliva is a continuously present, viscous, colorless, opalescent fluid in the mouths of humans and other animals. It is made up of amylase, water, mucus, proteins, and mineral salts.

Saliva takes up food particles, bacterial cells, and white blood cells as it moves about in the oral cavity. Every day, a person's mouth excretes one to two liters of fluid.

The total amount of saliva is produced by three primary pairs of salivary glands as well as numerous smaller glands that are dispersed across the has included of the cheeks, lips, tongue, and palate.

The mouth naturally produces small amounts of saliva on a regular basis, but the introduction of food, or even just the scent or idea of it, will significantly enhance saliva production.

Salivation serves a variety of purposes. In order to aid in speaking and transform foodstuffs into a liquid or semisolid material that can be tasted and taken more readily, it primarily lubricates and moistens the interior of the mouth.

Therefore the correct option is B.

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what might happen to the finch populations after millions of years?​

Cancer cells are developed through a malfunction within the cell cycle. Which

point of the cell cycle would have the highest risk of cancer if it malfunctioned or

did not work properly? *

O

Interphase

Mitosis

Meiosis

Cytokinesis

what is the relationship between a protein the cell and DNA?
a. DNA is produced by protein which is produced in the cell
b. dna controls the production of protein in the cell
c. protein is composed of DNA which is produced in the cell
d. a cell is composed of DNA and protein

where do all of the cells in the human body come from

which of the following correctly pairs the reproduction with cell the process or processes that are directly involved

1. A. asexual reproduction; mitosis and meiosis

2. B. asexual reproduction; meiosis

3. C. sexual reproduction; mitosis and budding

4. D. sexual reproduction; meiosis ​

Which of the following describes the location of the polar climate zone?


1. Between the tropical and the temperate zones
2. Farthest from the equator
3. From away from the north pole and south pole
4. Closest to the equator

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Hammed has 200 stamps. 35% from Europe, 10% from Asia , 20% from Australi The rest of the stamps from North America. How many of Hammed's stamps are from North America?

Please help me if you know the answer please

True or False: Births, deaths and migration do not factor into changing the size of a population...

The quantity of matter in an object is a measure of its:

matter
inertia
mass
atoms

PLS HELP. CORRECT ANSWER GETS BRAINLIEST
1. While Deena is watching the news on TV, She hears that there going to be a solar eclipse the next day. The news announcer gives advice on how to view a solar eclipse safely, and describes what is happening when a solar eclipse occurs. What causes a solar eclipse to occur?

The Moon passes between the Sun and Earth.

The Sun, the Moon, and the Earth form a right angle.

Earth and the Moon are on opposite sides of the Sun.

Earth and the Moon are at their farthest distance from the Sun.

How many of each nitrogenous base is in your template?

The external openings of the airway include which of the following features? (multiple answers)

mouth
lungs
alveoli
nose
diaphragm

Scientists have observed that new crust, such as mid-ocean ridges, is formed where two plates are moving away from each other. Based on this observation and the data on the maps, where do you suspect that old crust is destroyed and recycled? Provide three specific locations on the map where you think this process is occurring

Explain what would occur if the population of an animal such as a beaver, changes the environment and can increase the number of individuals in that area. In other words, explain how a change to an environment can cause an increase in an animal population.

Your answer:

What amazing adaptation does the snowshoes hares have?
How does this adaptation help it to survive or reproduce?

amino acids come from which type of organic molecule?

Field mustard is an annual plant that grows wild in many regions of the world. It has small yellow flowers and is pollinated by insects. Field mustard has to flower and produce seeds to give rise to the next generation. Southern California experienced a severe drought between 2000 and 2004. Plants that flowered earlier reproduced. Those that flowered later died without producing seeds. This led to more early-flowering field mustard plants. This change in population characteristics took only a few generations.

How do you think scientists discovered that the flowering time of the field mustard had changed?

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PLEASE WRITE A SUMMARY ABOUT THE LAW OF UNIVERSAL GRAVITATION

Translation practice

1.)Low tide is the best feeding time for land predators such as sea gulls.

True

False

2.)Plants are not part of food chains.

True

False

3.)
Both currents and tides are predictable patterns of movement in water.

True

False

4.)
The main benefit of an upwelling is that it

creates strong tides in coastal regions

increases the salinity of the water in an area

brings new nutrients into an underwater region

wipes out entire ecosystems, allowing for secondary succession

5.)Which of the following is true of brackish water?

The salinity of the water can vary with the tides.

There is usually more fresh water than salt water.

Very few organisms can survive in brackish waters.

It is most common in the deepest region of the ocean.

6.)A high tide will occur

usually only once in a 24-hour period

only in bodies of water close to the moon

on both sides of the earth at the same time

when proximity to the sun makes the days longer

7. Brackish water is most commonly found in

seas

rivers

oceans

estuaries

8.)All of the following are characteristics of the blue crab EXCEPT

it has no natural predators

blue crabs often feed on each other

it can adapt to varying levels of salinity

it migrates to cooler temperatures as it ages

9.)Unusual weather can change the tides.

True

False

10.)Black sand can be found when

tides are particularly high

sediment contains volcanic ash

local residents prefer it to light sand

all the sand is washed away from the beach

11.)Which of the following is a benefit of inhabiting an estuary?

The water levels are consistent.

The salinity levels are usually stable.

There are fewer strong ocean currents.

Very few predators can survive in brackish water.

12.)All of the following can influence tides EXCEPT

winds

hurricanes

heavy rains

the shoreline

13.)All of the following influence tides EXCEPT

the sun

the moon

the air temperature

the rotation of the earth

14.)The organisms that can tolerate the most time out of water would live in the

spray zone

high-tide zone

middle-tide zone

low-tide zone

15.)When the pull of the moon is strongest, tides will be lowest.

True

False

What is index of refraction and what does it have to do with the speed of light?

What is the relationship between DNA mutations and the disorders? Disorders:Hemophila,Beta thalassemia, and Sickle Cell Disease

Based on the timeline for the succession of a beech-maple forest in the previous question, infer the amount of time that this restoration project has been occurring.

What is the full function of the inner ear.​

Which type of fertilization and development occurs
in the life cycle of the organisms represented below?

Here is a model of Earth's yearly orbit around the Sun. In this model, the names of the seasons apply only to the northern hemisphere, Seasons in the Northern Hemisphere Equinox March 20 or 21 Solstice June 20,21, Spring Winter Summer Autumn Solstice December 21 or 22 Equinox s September 22 or 23 Examine the model, and think about how it would be different for the southern hemisphere. What causes the southern hemisphere to experience summer? A. Earth's north pole is tilted toward the Sun. B. Earth's axis and its equator are at different angles. C. Earth's axis and its orbit plane are at different angles. D. Earth's south pole is tilted toward the Sun.​

List 3 main types of weather
ering​

Select the correct answer.
A construction company wants to trap pollutants in runoff at
its sites. What should the company do?
© A. Practice conservation tillage at the sites.
B.
Release beneficial insects, such as spiders and ladybugs, at the sites.
C.
Plant grass and lay straw at the sites.
D.
Plant trees at the sites.