Can anyone give me a quick crashcourse on cellular respiration in detail. i'm in high school and this is even more confusing than photosynthesis.

What is thought to have caused the mass extinction at the end of the cretaceous period?

The combining form leuk/o means red true or false

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.