Because it's the most abundant gas in atmosphere , required by plants
Answer:
Andrea will study how many species in the area have gone extinct or endangered.
Explanation:
B) Primary producers. Autotrophs are organisms that produce their own food through photosynthesis, which are primary producers.
Answer:

Explanation:
Proteins are found inside the cell. There are proteins in the cell membrane and cytoskeleton, they act as enzymes inside the cell, and they are created inside the cell during protein synthesis at the ribosome.
Since proteins are part of the cell and are made inside the cell, the <u>proteins</u> must be smaller.