In thermodynamic studies, energy changes are analyzed in a collection of matter called a ________. All other matter in the universe is called the ________.
Fill in the blank(s) with the appropriate word(s).
system; surroundings
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Why is wood a remarkably difficult material to decompose? Select all correct choices
A. Wood contains cellulose. B. Wood contains lignin. C. Most bacteria can't break down lignin. D. Most fungi can't break down lignin.
Endospores are resistant to most environmental stressors because they have ________ complexed with calcium ions which stabilize DNA.
Fill in the blank(s) with the appropriate word(s).
Certain chemicals like DDT undergo biological magnification because
a. reactions within prey convert similar compounds into DDT. b. many smaller prey animals consume DDT as a nutrient. c. consumers store all of the DDT present in the prey they consume. d. more DDT in the environment sticks to larger consumers. e. DDT accumulates in water supplies and larger consumers drink more water.
The impact of a keystone species is proportionate to their abundance in an ecosystem. Indicate whether the statement is true or false