Horseshoe crabs have lived in the earth’s oceans for ____ years

a. about 4 thousand
b. close to 400 thousand
c. less than 40 million


d. over 400 million
e. over 4 billion


ANSWER: d

Biology & Microbiology

You might also like to view...

Identify the structure indicated by #5:

A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland

Biology & Microbiology

What role do bacteria play in mudflat food webs?

a. Primary consumers b. Primary producers c. All of these choices d. Consumers

Biology & Microbiology

Autoimmunity is typically due to

A. a deficiency in T-cell development. B. a transfusion reaction. C. graft rejection. D. IgE and mast cells. E. autoantibodies and T cells.

Biology & Microbiology

Which of the following statements regarding the chemical grooming of pyruvate is false?

A) Two molecules of pyruvate are each converted into two-carbon molecules joined to a coenzyme A molecule. B) Each pyruvate loses a carbon atom, which is released as CO2. C) Two pyruvate molecules together contain less chemical energy than was found in the original glucose molecule. D) Each pyruvate molecule has a CO2 added and then joins with an NADH.

Biology & Microbiology