During weeks 5 - 6 which major structural feature is present on the developing embryo?
a. Stubby tail
b. Pharyngeal arches
c. Lower limb buds
d. Umbilical cord
e. Distinct fingers and toes
d
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The chelicerates (select all that apply)
A. include spiders, scorpions, and their relatives. B. are known for their venoms. C. were among the first animals to invade land around 400 million years ago. D. have pincer-like claws, antennae, and wings. E. are ecologically diverse, particularly in their food habits, with different groups specializing on a wide variety of plant and animal foods.
An explanation for a biological process that is substantiated by a large body of evidence is called a ______.
A. hypothesis B. theory C. systems biology D. reductionism E. prediction
How does habitat fragmentation affect biodiversity?
a. As long as the fragments are of good quality habitat, biodiversity will not be affected. b. Habitat fragmentation increases biodiversity because it reduces entry of exotic species. c. Habitat fragmentation is a threat to biodiversity because small habitat patches sustain only small populations. d. Habitat fragmentation increases biodiversity because adaptation to local conditions stimulates evolution. e. Habitat fragmentation connects terrestrial and aquatic habitats.
The pioneer finches that colonized the island of
Kauai thrived on __________ of the native plants. a. the leaves b. the nectar c. the seeds d. the fruits e. all of these parts