If two animals are living together and the death of one results in the death of the other, the two animals were 

A. competitors.
B. vectors.
C. mutualistic.
D. predators.


C. mutualistic.

Biology & Microbiology

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Trial-and-error learning is also called ____ conditioning

Fill in the blank with the appropriate word.

Biology & Microbiology

Secondary lymphoid organs

A. are strategically located in the body. B. facilitate interactions between cells. C. are hematopoietic. D. are the site of T cell maturation. E. are strategically located in the body AND facilitate interactions between cells.

Biology & Microbiology

A culture medium on which only salt tolerant Gram-positive organisms grow and the colonies are a mixture of pink and yellow is called a(n):

a. Selective medium b. Differential medium c. Enriched medium d. a and b e. b and c

Biology & Microbiology

In humans, X-linked genetic diseases

a. are associated with autosomes. b. tend to be expressed more in females than males. c. only affect males. d. tend to be expressed more in males than in females.

Biology & Microbiology