What is the main form of nitrogenous waste released by mammals to their environment?

a. amino acids
b. urea
c. ammonia
d. nitrate


Answer: b. urea

Biology & Microbiology

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Four of the five answers listed below are

examples of mutualism. Select the EXCEPTION.

a. plants and pollinators b. plants and seed dispersal by fruit-eating animals c. mycorrhizae d. phorid flies and red fire ants e. anemone fish and anemones

Biology & Microbiology

Which one of the following is NOT an example of behavior? 

A. A plant bending toward a light B. A student sleeping in class C. The wind rustling fallen autumn leaves D. A cat purring

Biology & Microbiology

Chromosomes that have replicated consist of two copies that are still joined to each other. The two copies are referred to as a pair of

What will be an ideal response?

Biology & Microbiology

Which are the first to attack cancer cells and virus-infected cells?

A. cytotoxic T-cells B. suppressor T-cells C. delayed hypersensitivity T-cells D. helper T-cells E. natural killer (NK) cells

Biology & Microbiology