When do scientists believe life originated on Earth?

A.

3 to 4 billion years ago

B.

600 million years ago

C.

less than 6,000 years ago

D.

over 5 billion years ago

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

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?

The science of naming organism and putting them into classification group is?