You are shown an example of two organisms in a relationship, in which one lives on the other. The organism living on the other benefits from nutritional resources, while the organism being lived upon is harmed. This is an example of

A. predation.
B. mutualism.
C. commensalism.
D. parasitism.
E. intraspecific competition.


D. parasitism.

Biology & Microbiology

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Why is external water not essential for fertilization in seed plants? 

A. The sperm cells in seed plants are capable of resisting desiccation. B. Seed plants use pollen instead of sperm for fertilization. C. Pollen grains are transported by wind or an animal. D. Sperm cells are used to transport pollen to the archegonia. E. Ovules are contained within the pollen.  

Biology & Microbiology

What is contained in the coelom?

a. ingested nutrients and digestive enzymes b. primarily the epidermis, dermis, and hypodermis c. most of the organism’s organs d. undigested waste material

Biology & Microbiology

The size of a population is affected by all of the

following EXCEPT a. biotic potential. b. trophic level. c. carrying capacity of the environment. d. death rate. e. birth rate.

Biology & Microbiology

Polar bears are top predators, and tests on their tissues have shown a surprising ____.

A. resistance to warming B. amount of protein C. resistance to disease D. amount of mercury and organic pesticides E. amount of nutrients

Biology & Microbiology