Whales have truly large body sizes. The only invertebrates that attain body sizes much larger than humans are giant squids. What feature do whales and giant squids share that allow them to attain such large sizes?
A. Large brains
B. Highly efficient gills
C. Endothermy
D. Internal skeletons
Answer: D
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A farmer is concerned that if she plants seeds for her next harvest, many of them will remain dormant and fail to grow. Depending on the plant, what steps can the farmer take to ensure that many of her seeds will germinate?
A. She can treat her seeds with red light prior to planting. B. She can put her seeds in the refrigerator for a few months before planting. C. She can rub her seeds with sand paper prior to planting. D. She can feed the seeds to her cows and collect them after they have passed through the animals' digestive tracts.
In general, species richness follows a longitudinal gradient
Indicate whether the statement is true or false.
How do birth control pills prevent fertilization?
A. They alter the uterine environment so that sperm cannot survive. B. They prevent follicle development and ovulation. C. The provide hCG, indicating that fertilization has already occurred. D. They inhibit menstruation. E. They prevent implantation.
If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross AaBb × AaBb?
A) 16:0:0:0 B) 8:4:2:2 C) 1:1:1:1 D) 9:3:3:1