2 lowercase letters means that the recessive gene is visible, so it should be red feathers
Answer: Well really the digestive, respiratory and circulatory systems all work together to make cellular respiration possible so i guess you could choose a or b
Explanation:
1. hydrosphere: the system that contains all forms of water; liquid, solid and gas
2. biosphere: the sphere that contains all living things
3. atmosphere: the system that contains the gaseous layer of a planet
4. cryosphere: the system that contain the frozen ice portion of a planet
5. lithosphere: the system that contains the solid rocky crustal portion
It is d, a substance that participates in a chemical reaction. You can also tell it just by looking at the stem of the term :)
They should be limited to suit your needs not overdoing it or underdoing just to a healthy weight.
