At the end of the mitotic cell cycle, a cell divides into two cells. What must happen before the cell divides?

A

The number of organelles doubles.

B

Chromosomes must be copied.

C

Four nuclei must be formed.

D

The membrane thickens.

The dodo, a bird that lived on islands, became extinct in the 17th century. Dodo birds could not run fast or fly. Sailors hunted them for food. Settlers brought predators like pigs and monkeys, which ate the dodo birds.

How are sponges and the coral in coral reefs similar

A tomato plant grows in the direction of a source of light.

Ossification occurs in which of the following? A) embryos B) newborns children and teenagers C) embryos and newborn children D) embryos, newborn children, and teenagers

Jessica is doing an investigation to see how many birds come to the tree in her backyard each morning. She repeats her investigation every morning for four days.

what is thermometric property ... ?

When fats first reach the duodenum what their presence stimulates the release of which hormone from the intestinal mucosal cell?

Ocean-dwelling chemoheterotrophic bacteria that generate energy via aerobic respiration are dependent on the presence of photoautotrophs like cyanobacteria because:

Nucleotide are composed of phosphate group, a sugar, and a nitrogenous base. DNA is made up of long strands of nucleotide. which part if the above molecule can differ between nucleotide? A. the sugar B. the phosphate group C. the nitrogen group D.

2 atp molecules are needed to start A) the krebs cycle B) gyycolysis C) the electron transport chain D) none of the above