Flatworms can reproduce:

a. asexually.
b. sexually.
c. by reciprocal copulation.
d. all of the above


D

Biology & Microbiology

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A sporic life cycle is NOT characteristic of which of the following groups?

A. ginkgos B. angiosperms C. mosses D. conifers E. charophyceans

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Cnidarians have an outer layer derived from ectoderm, an inner layer from endoderm, and a ____

a. middle layer of mesoderm b. watery middle layer c. well-developed brain d. jellylike matrix in between e. complete gut

Biology & Microbiology

The evidence supporting Porto Santo rabbits as a new and recent species does not include:a

a different coat color pattern from mainland European rabbits. b. the ability to produce fertile offspring with mainland rabbits under experimental conditions. c. a more nocturnal lifestyle. d. being only about half the size of the mainland rabbits. e. the inability to produce fertile offspring with mainland rabbits under natural conditions

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The perforin-granzyme pathway involves

A) the production of fever, which kills the pathogen. B) the production of antibodies toward the invading pathogen. C) the synthesis of special cell-killing proteins that act on infected or abnormal cells. D) presenting the foreign antigen to B cells. E) binding CD95L to infected cells, which eventually leads to cell apoptosis.

Biology & Microbiology