The two words are Genus and Species.
Answer:
because they have thicker walls
Explanation:
blood is punped our of the heart very fast which means it would need a blood vessel witch thick walls to withstand the pressure. thin walls would cause the blood vessle damage and may evwn break as it wouldn't be able to withstans the pressure.
Its 3 of the same molecule.
Answer:
B. separating strands of DNA
The answer is B. Meiosis involves two cycle of cell division.