Describe the distinguishing organisms and major biological events associated with the following geological time units
A. Precambrian time
B. Paleozoic era
C. Mesozoic era
D. Cenozoic era What will be an ideal response?
Concepts to Consider: Precambrian--bacteria, protists, fungi and simple multicellular
animals. Paleozoic era--all major groups of plants (except angiosperms) and all animal phyla
appeared; also associated with the largest extinction event. Mesozoic--diversification of
reptiles, including dinosaurs, and the appearance of flowering plants, insects, birds, and early
mammals; a major extinction event, probably due to a meteor impact, resulted in a massive
extinction at the end of this era. Cenozoic era--continued diversification of flowering plants,
birds, insects, and mammals.
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Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 has two extra neutrons. These two forms are:
A. oxygen ions. B. oxygen dimers. C. oxygen isomers. D. oxygen isotopes.
An example of an obligatory mutualism involves which two organisms?
a. acacia trees and ant colonies b. mycorrhizae and legumes c. cattle egrets and cattle d. plants and herbivores e. tapeworms and pigs
The probability of a crossover occurring between two genes on the same chromosome _____
a. is unrelated to the distance between them b. decreases with the distance between them c. increases with the distance between them
The dominant stage of the moss life cycle is the
A) sporophyte. B) gametangium. C) pollen. D) gametophyte.