The heart muscle itself receives oxygen and nutrients from blood transported by the ________ arteries
Fill in the blank(s) with correct word
coronary
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How is binary fission similar to mitosis with cytokinesis?
A. Both are modes of sexual reproduction. B. Both occur only in eukaryotes. C. Both occur only in prokaryotes. D. Both involve replication of DNA and separation of DNA equally into two daughter cells. E. Both give rise to offspring that are genetically different from the parent.
Succession in “old fields” is often reconstructed using ______
a. field experiments b. laboratory experiments c. historical records d. evolutionary records e. fossil records
Which of the following is NOT true of colony
collapse disorder (CCD)?
a. 30% of hives in the United States have been affected b. in CCD worker bees abandon their colonies c. animals and plants other than our agricultural animals and plants are affected in one way or another d. CCD is now on the decline e. all of these are true of CCD
Introduced species are a problem all over the world, and there are many examples in the United States. Several years ago, a fisherman caught a northern snakehead fish in a pond in Crofton, Maryland (a suburb of Washington, DC). Snakeheads are a favorite food of immigrants from China, and live fish can frequently be found in Asian markets. It's suspected that the fish in the Crofton pond were purchased locally and then intentionally released. Snakeheads are top predators, and 90% of the northern snakeheads' diet consists of other fishes. The northern snakehead can breathe out of water and travel short distances (about 100 feet) across land. They also breed rapidly. Females can lay more than 100,000 eggs per year. Juveniles have also been identified in the Potomac River and other rivers in
Pennsylvania. When snakeheads enter aquatic ecosystems, biodiversity in these ecosystems would most likely A) increase, since another species has been added to the environment. B) decrease, since the snakehead will prey on native species. C) remain the same, since local species will prey on the snakeheads and remove them. D) remain the same, because the snakeheads will merge without problems into established communities.