A couple has two female children. What is the probability that their next child will be male?
A) 25%
B) 50%
C) 33%
D) 67%
B
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Which of the following BEST describes the process of nitrification?
a. N2 ? NH4 + b. NH4 + ? N2 c. N2 ? NO3 ? d. NO3 ? ? N2 e. NH4 + ? NO3
Fishery effort combined with catch data is used to
a. determine if a fishery is in jeopardy. b. determine the pay rate for fishers. c. determine the economic value of a fishery. d. estimate the ocean's productivity.
A zygote forms
a. as soon as a sperm cell penetrates an egg cell. b. when the embryo implants in the uterine wall c. when a fertilized egg divides to produce two cells. d. after at least two divisions of a fertilized egg. e. after many divisions of a fertilized egg.
The beginning of each gene in DNA is marked by the presence of a base sequence that RNA polymerase can attach to. This is called the ________
Fill in the blank(s) with correct word