Before there was any life on earth, which gas was absent from earth's ancient atmosphere?

A. nitrogen

B. ammonia

C. oxygen

D. methane

Phytoplankton are the main primary producers on land.

In a cross between Rr and Rr what's is the probability of the offspring showing a recessive trait?

Which of the following is NOT a renewable form of energy? A. Biomass B. Solar C. Coal D. Geothermal

The aqueous environment is made up of which molecule?

Susan makes a claim that humans do not evolve because we adapt to situations by changing our technology, not ourselves. Which piece of evidence contradicts this idea? Humans have been tool users for a long time. Other primates use tools.

A mutation in GLUT4 changes the Kt value from 5 mM (wild type) to 3 mM (mutant). The velocity of glucose entry into a mutant cell would be higher than a cell expressing the wild type version at a blood glucose concentration of 5mM. A) TRUE. B) FALSE.

Hich of the following is an advantage of asexual reproduction? A. No mate is required. B. It increases genetic diversity. C. More time is required. D. More energy is required.

Question 18 Which term best describes the diagram below? Eye color Blood type . Hair color Growth

Why did mendels use characteristics that only had 2 options? how did this aid in the development of his theories?

8. Modern fishing practices threaten biodiversity mainly through the