What is the major reason that deforestation is difficult to reverse?
a. The soil is too acidic.
b. Trees must have shade to grow.
c. Landslides become too frequent.
d. Soil nutrient loss and drier, hotter conditions make it difficult for seedlings.
e. Seeds cannot spread.
d
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Which of the following is NOT true of seedless vascular plants?
a. Sporophytes are independent of gametophytes. b. Water is not needed for gamete transport. c. Sporophytes have vascular tissue. d. Seeds are not produced. e. Living members still exist
All animals are
a. multicellular, heterotrophic, and diploid. b. multicellular, heterotrophic, and haploid. c. multicellular, autotrophic, and diploid. d. multicellular, autotrophic, and haploid. e. unicellular, autotrophic, and haploid
Research on conditions that are relatively new to human populations such as myopia, breast cancer, and obesity support the conclusion that ________
A) human populations have accumulated a number of mutations that have become fixed by genetic drift B) the changes in human lifestyle account for all of the increase in frequencies of these conditions C) these conditions are indeed "diseases of civilization" and are likely caused by the interaction between genes (genetic susceptibility) and novel environments D) these human conditions are mere artifacts of the way in which they have been evaluated
From what environment were Archaea first isolated?
a. from salt lakes b. from Mars c. from freshwater lakes d. from a human patient