A scientist measures the temperature of a lake at various depths and finds very little variation between temperatures at the surface and at the bottom of the lake. The temperature measurements were most likely taken in a
A) temperate lake during summer.
B) temperate lake during winter.
C) tropical lake during summer.
D) tropical lake during winter.
B
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If a gene has two alleles, and allele A has a frequency of 83%, then allele a has a frequency of ____
Fill in the blank with the appropriate word.
Upon finding a carcass, a raven will only call and attract other ravens to the food source if the ____
a. nearby ravens are relatives b. food source is large and plentiful c. food is found in a resident pair's territory d. food is found in his own territory e. food is being consumed by an animal of another species
The genotype for a pea plant that is homozygous recessive for both height and pea color would be:
a. tt. b. YY. c. TtYy. d. ttyy. e. TTYY.
Which of the following statements about heartwood is false?
a. It functions in conduction. b. It is a storage site for waste products. c. It is resistant to decay. d. It provides structural support. e. It is located in the center of a tree.