In tropical areas about ____% of the mangroves remain
a. 5
b. 10
c. 15
d. 35
e. 50
E
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Some researchers claim that sponge genomes have homeotic genes, but no Hox genes. If true, this finding would _____.
A) mean that sponges must no longer be classified as animals. B) mean that extinct sponges must have been the last common ancestor of animals and fungi. C) confirm the identity of sponges as "basal animals." D) strengthen sponges' evolutionary ties to the Eumetazoa. E) require sponges to be reclassified as choanoflagellates.
Lichens of the supralittoral fringe are compound associations between:
a. algae and bacteria. b. fungi and bacteria. c. bacteria and cyanobacteria. d. fungi and algae. e. algae and cyanobacteria
Charles Darwin and Alfred Russell Wallace are both credited with developing key ideas about evolution. Each of the following statements expresses their ideas except one. Choose the exception
a. The survival of the population is the key to evolution. b. All living organisms are the descendants of common ancestors. c. Increased survival and reproduction are the keys to evolution. d. The better adapted individuals are to an environment, the more likely they are to survive and reproduce. e. Modification of body plans and behaviors of organisms has led to descent with modification.
Which type of cell directly attacks infected cells?
a. Bacterial cells b. Helper T-cells c. Cytotoxic T-cells d. Cancerous cells