Bears eat berries, humans, and large fish; large fish eat smaller fish and insects; humans eat bears, large fish, and berries; Venus flytraps eat insects. The scenario described here is an example of ________
A) an ecosystem
B) parasitism
C) a food web
D) a food chain
C
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Some fungi live as single cells, called ____
a. hyphae b. hypha c. zygospores d. mycelium e. yeast
Many male songbirds are brightly colored. However, the color of the birds is usually determined by a balance of
A. sexual selection that reduces bright colors and natural selection in favor of bright colors. B. natural selection against bright colors due to predation and mutations that introduce bright colors. C. mutations that reduce bright colors and gene flow in favor of bright colors. D. natural selection against bright colors due to predation and sexual selection in favor of bright colors. E. mutations that reduce bright colors and sexual selection in favor of bright colors.
What is a symptom of Cushing's disease?
a. loss of ability to cope with stress b. mild infection c. abnormally large face and hands d. fat deposition around the trunk e. intellectual disability
The cells of the immune system that are responsible for attacking cells that have become cancerous are the:
a. B-cells b. cytotoxic T-cells c. helper T cells d. suppressor T cells (T regulatory cells)