What would be strong evidence to suggest a protist is phototrophic?
A. Many lysosomes
B. Silicon dioxide cell walls
C. Locomotion via several flagella
D. The presence of chloroplasts
E. A benthic lifestyle
Answer: D
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Biologists believe that whooping cranes suffer from a high rate of developmental deformities of the spine and trachea
because of ____.
a. biological magnification of DDT b. exposure to hormone-mimicking pollutants from plastics c. a population bottleneck and loss of genetic variability d. conservation biologists saving chicks that would have died at hatching e. exposure to PCBs used as insulators in electronics
Humans are _______.
a. Australopithecus b. Homo erectus c. Ardipithecus d. Homo sapiens e. Homo habilis
Sexual reproduction occurs in the ___ host
a. intermediate b. definitive
During the spring, male sage grouse gather in an open area and strut about, erecting their feathers in a fanlike display. They also make booming sounds using their inflated air sacs. The function of this dance is to
A) frighten off smaller birds from the territory. B) select the showiest females and mate. C) attract the attention of females. D) imprint the younger male birds.