Describe how clay can enhance the quality of soils. How can too much clay negatively affect soils? What will be an ideal response?
ANSWER: Clay particles enhance the quality of soils because they have a negative charge that attracts
positively charged mineral ions in soil water. Thus, clay-rich soil retains dissolved nutrients
that might otherwise trickle past roots too quickly to be absorbed. Soils with too much clay
pack so tightly that they exclude air—and the oxygen in it
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A disadvantage of the phylogenetic species concept is that it
A. cannot be applied to all organisms. B. cannot be used for molecular data. C. may be difficult to determine the number of traits necessary to characterize individuals. D. cannot accommodate clear-cut qualitative characteristics. E. is impossible to determine reproductive isolation.
Nudibranchs belong to the class ____ of the phylum Mollusca
a. Gastropoda b. Cephalopoda c. Bivalvia d. Polyplacophora e. Pulmonata
The endocrine system is integrated with what other system to provide coordinated control of an organism?
a. circulatory b. digestive c. integumentary d. nervous e. urinary
Which of the following are most permeable to
water and small molecules? a. glomerular capillaries b. peritubular capillaries c. afferent arterioles d. ureters e. efferent arterioles