The body will not get oxygen if which system fails? muscular

excretory

respiratory

skeletal

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

Brainliest ! which would require more force to move or slow down between a bowling ball and a soccer ball? explain why?

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -