The part of the top soil that is characterized by its spongy organic matter that is chemically complex and hard to break down is

A. topsoil.
B. creosote.
C. humus.
D. clay.
E. silt.


C. humus.

Biology & Microbiology

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How did the experimental group differ from the control group in the 2005 peacock butterfly experiment?

a. They were different species. b. Their native habitat of the forest differed. c. They were spotless and soundless. d. They tasted worse. e. They preferred different flowers species.

Biology & Microbiology

What is removed from dNTPs to provide the energy required for DNA polymerase to catalyze DNA strand elongation?

What will be an ideal response?

Biology & Microbiology

Which is matched incorrectly?

1. malaria; mosquito 2. balantidiasis (caused by Balantidium); pigs 3. trichomoniasis; kissing bug 4. toxoplasmosis; cat 5. trypanosomiasis (African sleeping sickness); tsetse fly

Biology & Microbiology

The STD ________ causes an inflammation of the liver and is preventable by ________.

A. gonorrhea; vaccination B. syphilis; male condom C. HIV; vaccination D. hepatitis A; vaccination E. hepatitis B; using a male condom

Biology & Microbiology