what happened to the water vapor when the earth cooled 3 billion to 3.5 billion years ago? What formed?

Which of the following nucleotide sequences could it represent a segment of rna A - GGC B - CUA C - TTG D - GUC

Do prokaryotes have genetic material?

Name 2 ways forelimbs are different that hindlimbs

A controlled experiment is one that a. proceeds slowly enough that a scientist can make careful records of the result. b. tests experimental and control groups in parallel. c. is repeated many times to make sure the results are accurate. d.

Many animals foods like meat and fat are high in energy content. Where did this energy originate

One factor that can increase sensitivity to sunlight is genetics. a. True b. False

What is the policy used most by the Fed to change the money supply? a. changes in the money creation policy b. changes in the discount rate c. changes in the reserve requirements d. open market operations

Excision within the artery (of plaque from the arterial wall) is called

Which organ is a part of circulatory system? select one of the options below as your answer: a. brain b. heart c. lungs d. stomach?

Although they do not have recent common ancestors, birds and bats have similar body shapes necessary for powered flight. what pattern of evolution does this relationship represent?