Question

QUESTION 94

Which characteristic is shared by Phylum Cnidaria and Phylum Platyhelminthes?

		dorsoventrally flattened bodies
		radial symmetry
		a distinct head
		a digestive cavity with a single opening (sac-like)

1 points

QUESTION 95

Which of the following is not a characteristic of members of Phylum Porifera?

		choanocytes
		asymmetry
		nervous system
		spicules

1 points

QUESTION 96

Most animals are bilaterially symmetrical deuterostomes.

True

False

1 points

QUESTION 97

Parasitism is one of the most widespread life strategies to evolve. Which of the following supports this finding?

		Parasites almost always predigest their hosts' tissues and, therefore, spend less energy and require fewer structural adaptations.
		Parasites, unlike predators, feed on almost all the tissues of their hosts.
		Parasites do not generally kill their hosts; thus they can feed on the same host throughout the host's normal life span and do not have competition from decomposers.
		Parasites generally kill their host and can feed for a very long time because they are much smaller than their host.

1 points

QUESTION 98

The production of sterile mules by interbreeding between female horses (mares) and male donkeys (jacks) is an example of _____.

		reduced hybrid viability
		hybrid breakdown
		reduced hybrid fertility
		mechanical isolation

1 points

QUESTION 99

A snail-like, coiled, porous test of calcium carbonate is characteristic of

		diatomes
		ciliates
		water molds
		foraminiferans

1 points

QUESTION 100

Which group of algae can create "red tide"?

		Phaeophyta
		Dinoflagllata
		Rhodophyta
		Chlorophyta