Which two systems work together to provide oxygen when you are fast running in a race? * a. Muscle system and Skeletal system
b. Circulatory system and Respiratory system
c. Circulatory system and Bones
d. Digestive system and Femur

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

What happens when the cell copies its chromosomes