Flatworms can reproduce:
a. asexually.
b. sexually.
c. by reciprocal copulation.
d. all of the above
D
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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
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
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
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.