What did the presence of photosynthetic prokaryotes allow

A. more oxygen to enter the atmosphere

B. more water to enter the atmosphere

C. more sunlight to enter the atmosphere

D. more hydrogen to enter the atmosphere

How did Darwin arrive at the idea about species variation

What 3 parts make up the circulatory system

Charles Darwin studied finches on the Galápagos Islands. The finches on each island had slightly different beaks. According to Darwin, how did the finches all get different beaks?

Blood type in humans is an example of a. polygenic inheritance. b. incomplete dominance. c. sex-linked inheritance. d. multiple alleles.

What type of bond is shown below, where electrons are shared between the bonded atoms? A: covalent bond B: ionic bond C: hydrogen bond D: is crossed out

Does cell beneath formative phase differ from each other

Egg laying in fruit flies can be triggered (induced) when males deposit their sperm in the spermathecae of the females. what is the selective advantage of induced egg laying for the male flies?

What part of the brain is responsible for maintaining consciousness, mental processing, and normal speech?

Which of the following best explains how a dissecting microscope differs from a compound light microscope? A) We do not have enough evidence yet to call cell theory a law. B) We have not reviewed cell behavior enough yet to call it a law.

What happens to pyruvate molecules formed in glycolysis in the absence of oxygen?