What are structures like the stomach and intestines called? A.
tissues
B.
organs
C.
organisms
D.
cells

In a cladogram' when does a group of organisms branch off

Which of the follow describes a disadvantage secondary sources have compared to primary sources?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.