(1)As a cloud of gas and dust collapses on itself and becomes more dense, the temperature at the center of the cloud

A, Increase
B, Decrease,
C, Stay the same.

(2)What is the first step in the nuclear fusion process?

A, two helium atoms combine to make one hydrogen atom
B, two hydrogen atoms combine to make one helium atom
C, two helium atoms combine to make one carbon atom

Which element is found in both dna and proteins

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .

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.