Which eye is the best at detecting motion?
a. compound eye
b. single-lens eye
c. ocellus
d. ommatidia
e. photoreceptor
A
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Which of the vertebrates senses is the least well understood?
A. electroreception B. magnetoreception C. vision D. hearing E. touch
What was the average number of spots at the completion of your two experiments?
a. 2.5 spots b. 3.0 spots c. 4.5 spots d. 5.5 spots
Following cleavage of the zygote, which of the following is the first to occur?
a. blastula b. gastrula c. neural crest d. morula e. primitive streak
Each summer, a large "dead zone" devoid of fish and other animals develops where the Mississippi River flows into the Gulf of Mexico. What causes this?
A) Large quantities of fertilizer run off from Midwestern farm fields into the Mississippi River. B) Global warming is making the river water too hot for the fish to tolerate. C) High levels of pesticides are used in the Mississippi River basin. D) There are high levels of mercury in the river water. E) Acid rain makes the gulf's water too acidic to support fish.