Why are most energy pyramids limited to three to five levels


Answer: There is insufficient energy to support more trophic levels.

Biology & Microbiology

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To make a vaccine against mumps, measles, or rabies, which type of viruses would be useful?

A) dsDNA viruses B) negative-sense ssRNA viruses C) positive-sense ssRNA viruses D) dsRNA viruses

Biology & Microbiology

Crustaceans are _____.

a) ecdysozoans b) nematodes c) arachnids d) parazoans

Biology & Microbiology

Which genetic situation could most likely have confounded Mendel in his recognition of independent assortment?

A. Linked genes B. Crossing over C. Sex-linked inheritance D. Cloning E. Asexual reproduction

Biology & Microbiology

Volumetric thirst is caused by (A)________, and is detected by (B)____________ in the kidney and heart.

a. (A) hypovolemia (B) high blood flow b. (A) hypovolemia (B) low blood flow c. (A) hypotonicity (B) high blood flow d. (A) hypertonicity (B) low blood flow

Biology & Microbiology