How do scientists learn about the age of the solar system and its planetary bodies? Select the two correct answers. a. comparing the composition of the gaseous planets to the rocky planets

b. using radiometric dating of meteorites

c. measuring distances between planets

d. analyzing impact craters on planetary body surfaces​

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

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.