The correct answer is macromolecules are very large hydrocarbons constituted, what makes up macromolecules is hydrogen, oxygen, nitrogen and sometimes sulfur, I hope this is correct and helps you.
Answer:
B.When there is limited food
Explanation:
D a medium sized star because the largest star is canis majoris and the smallest star is brown dwarf..☺
Because they do not have an immune system, don't have noses, don't have mouths, and just plain do not have the same functions as animals, insects, or humans. They don't have a heart or a brain, which means they can't catch a cold. They can get diseases however.
2019 years have humans been on earth
