Discuss how the evolution of jawed fishes and other predatory creatures affected the marine ecosystem. What will be an ideal response?
The development of jaws was a major evolutionary advance because jawed fish could chew
food and become active predators, opening new ecologic niches. Natural selection favored
organisms that could protect themselves, or hide, from these predators.
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What evidence first indicated to scientists that the continents were once connected?
a. the apparent jigsaw-like fit of continents together, as in the case of South America and Africa b. the distribution of coal from tropical swamps of the past among North America, Europe, northern Africa, and Asia c. deformed igneous rocks in Brazil that highly resembled similar rocks in Africa d. the presence of Glossopterison fossils on five different continents e. the evidence of past isthmian links which allowed land animals to reach other landmasses across the ocean
A map symbol that looks like the letter "T" is used to record ________ on a map.
A. formation boundaries B. the orientation of a fold axis C. the location of fossils D. strike and dip E. the orientation of joints
The global human population
A) consumes fewer resources in a year than Earth can provide. B) has decreased its resource consumption in the last decade. C) would consume fewer total resources if everyone in the world consumed as many resources as the average American. D) needs 1.5 Earths to sustain its current rate of consumption.
APHIS oversees both
A) organic and USDA Organic certifications. B) agricultural bioterrorism and safety of GM organisms. C) regulation of pesticides and herbicides. D) the U.S. Departments of Agriculture and Food Security.