The first step in mitosis is: a cell splits apart
chromosomes pull away from each other
the nucleus of the cell forms
a second set of chromosomes is produced

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.