Introduced species are those species that have been brought to an ecosystem as the result of human actions. How do some introduced species affect biodiversity?
A) They decrease biodiversity because they are not adapted to surviving in the new ecosystem.
B) They increase biodiversity and have little impact on the ecosystem's food web.
C) They decrease biodiversity by preying on endangered organisms.
D) They increase biodiversity over time by always making the ecosystem more suitable for native species
Ans: C) They decrease biodiversity by preying on endangered organisms.
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The extinction of the dinosaurs is believed to have been caused by ________
a. competition from mammals b. a natural global cooling cycle c. an asteroid impact d. disease
In order to make Monday-morning staff meetings bearable, you and your colleagues take turns picking a theme for breakfast, and everyone who wants to eat is required to bring a dish that fits the chosen theme. This week, it’s your turn to choose, and you decide that it would be nice to have interesting jams and jellies for the inevitable bagels, so you pick “fruit spreads.” On Monday morning, three of your more sarcastic colleagues show up with bottles of ketchup, mustard, and pickle relish. Which of these technically qualifies as fruit spreads?
a. all three b. none c. ketchup and relish d. just ketchup
The granules of basophils contain ________.
A. digestive enzymes B. histamine C. antigens D. lysozyme E. antibodies
Choose the letter of the best match from the following:A. nitrogenB. calciumC. potassiumD. phosphorusE. magnesiumComponent of ADP, ATP, nucleic acids, and several coenzymes.
Fill in the blank(s) with the appropriate word(s).