Which group(s) of plants requires water in order for the sperm cell to swim to the egg?
a) seed plants
b) only ferns
c) only mosses
d) both mosses and ferns
e) all plants
Ans: d) both mosses and ferns
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What percent of undergraduate students who binged on alcohol also had other signs of alcoholism?
a. 10% b. 50% c. 25% d. 75%
particularly during DNA
replication and mitosis, are involved in crossing over during ____ of meiosis. a. prophase II b. prophase I c. metaphase II d. metaphase I e. telophase II
Birds differ from earlier vertebrates by ____
a. the presence of feathers b. producing land eggs c. the ability to maintain a constant body temperature through metabolic activities d. the ability to fertilize eggs internally e. their possession of a dorsal nerve cord
Random distribution of individuals in a population occurs when resource availability is ____ and individuals ____ one
another. a. scarce; attract b. clumped; neither attract nor avoid c. random; avoid d. uniform; neither attract nor avoid e. scarce; avoid