Answer:
1: 50 million years
2: The forefeet changed over time by the bones merging into one to create the hoofed feet that we are used to today.
3: Their teeth and skull changed over time to better fit the environment and food they fed on. Their feet and hight changed based on the physical requirements of the environment like walking across dense forests vs open prairies and how they had to move to access food.
4: The environment affected the way the horses evolved because they had to evolve to better fit and survive/thrive the new environments they lived in.
1. Circulatory system; transports oxygen, waste, nutrients, hormones, heat, and other substances around the body.
2. Respiratory system; responsible for gaseous exchange, that is it brings oxygen into the body and gets rid of carbon dioxide.
3. Endocrine system; controls the body functions using chemicals messengers known as hormones.
4. Skeletal system; provides shape and structure to the body and allows for movement, protects vital organs and produces blood cells.
5. Nervous system; receives incoming information and sends messages to the body about how to respond.
6. Immune system; fights disease or infections causing pathogens such as viruses, fungi, and bacteria.
7. Digestive system; Breaks down food into smaller molecules and absorbs these nutrients into the body.
8. Reproductive system; produces sex cells, produces sex hormones and nurtures the unborn baby.
9. Muscular system; allows for movement of the body and keeps the head in position and also provides heat.
10. Urinary system; Cleanses the blood, gets rid of body wastes and maintains salts and water balance.
Two the independent and dependent
Explanation:
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Answer:
Parsec equal to about 3.26 light years.
Explanation:
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