Compound leaves
A. have two or more petioles per blade.
B. have a blade divided into leaflets.
C. are toothed at the edges.
D. are alternately arranged.
E. have palmate venation.
B. have a blade divided into leaflets.
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Humans provide ecological niches for bacterial populations
A. true B. false
The second law of thermodynamics states that ____
a. the energy of the universe is a constant b. energy can be neither created nor destroyed c. energy disperses spontaneously d. energy transformations create a more orderly universe e. energy and matter are the same thing
To meet the high oxygen demands of flight, birds _____
a. use simple lungs b. use air sacs connected to their lungs c. use carbon dioxide for respiration d. can diffuse oxygen through their skin e. use simple lungs, and can diffuse oxygen through their skin
The movement of nutrient in the form of a gas takes place in which cycle?
a. global water cycle b. atmospheric cycles c. sedimentary cycles d. solar-plant cycle e. all of these