Which animal has a double digestive opening?

a. coral
b. a flatworm
c. an earthworm
d. a hydra


Ans: c. an earthworm

Biology & Microbiology

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In island biogeography, larger islands support ______ species than smaller islands.

A. more B. fewer C. larger D. stranger E. smaller

Biology & Microbiology

Introducing a foreign piece of DNA into an organism in such a way that it can be passed along through the germ line (eggs and sperm) and hence to subsequent generations creates a ________ organism

Fill in the blank with correct word.

Biology & Microbiology

What is the most outstanding characteristic of prokaryotic cells?

a. Prokaryotes have an elaborate system of internal membranes. b. Prokaryotic cells do not have a cell wall. c. Prokaryotic cells contain energy-collecting pigments. d. Prokaryotic cells do not have a nuclear membrane. e. Prokaryotic cells possess a variety of organelles.

Biology & Microbiology

Saturated fats are saturated with ________

A) carbon B) nitrogen C) hydrogen D) oxygen

Biology & Microbiology