Scientists have found meteorites that formed out of the same material as the planet earth. they have used a technique known as to determine that these meteorites are 4.55 billion years old. scientists have used this information to infer that the is also 4.55 billion years old.
a. superposition; universe
b. radioactive dating; universe
c. radioactive dating;
d. earth superposition; earth

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.