Write a paragraph explaining why leeches might be used after microsurgical procedures based on what you know about leech saliva.

The saliva of leeches contains chemicals that act as a(n) _____.

Compare the type of circulatory system found in annelids with that found in some mollusks. State the advantage of the annelid type.

Which of the following animals is incorrectly paired with its feeding mechanism? a. lion—substrate feeder b. baleen whale—suspension feeder c. aphid—fluid feeder d. clam—suspension feeder e. snake—bulk feeder

Summarize how earthworm muscles interact to cause movement.

Compare and contrast earthworms to flatworms and roundworms.

What is the advantage of enteral feeding over parenteral feeding?

Compare and contrast suspension feeding and deposit feeding.

Make a dichotomous key that would distinguish the differences among the three classes of mollusks.

Summarize the main features of the three classes of mollusks.

Production of synthetic fertilizers is an example of _____ and one process that enables plants to use fertilizer is _____. (a) nitrogen fixation/nitrification, (b) nitrification/nitrogen fixation, (c) nitrification/assimilation, (d) denitrification/nitrification, (e) mineralization/leaching.

To develop sickle cell anemia, you must inherit the sickle cell gene from _______. A. your mother, B. your father, C. both parents, D. grandfather

Earthworms are beneficial to the soil because they?

A species of bivalves on one beach is a pale color compared to the same species that is a much darker color on a beach 1100 km to the north. Design an experiment that might explain the differences in shell color.