Which molecule is not formed by covalent bonding?
A) H2O
B) CH4
C) O2
D) NaCl
E) H2
D) NaCl
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Some plants require water for reproduction. This is because
a. it is needed for germination of the spores. b. the eggs would dry out otherwise. c. the sperm are motile and need to swim to the egg to accomplish fertilization. d. the plants must be actively growing in order to reproduce. e. the seeds will be carried on the water to new sites.
Which of the following should be present in the
human diet in the highest percentage? a. protein b. carbohydrate c. lipid d. vitamins e. minerals
Rhizobium bacteria live in root nodules and
A. fix carbon dioxide so that the carbon may be used to build glucose. B. increase the surface area, thereby increasing the water absorbing capacity of the plant's roots. C. fix atmospheric nitrogen to NH4+ to build organic compounds. D. All of the answer choices are correct.
A toad that eats a bee and is stung tends to avoid eating bees afterward. This is an example of ________ learning
Fill in the blank(s) with correct word