Which of the following is a widely supported explanation for the tendency of tropical communities to have greater species diversity than temperate or polar communities?
A) They are less likely to be affected by human disturbance.
B) There are fewer parasites to negatively affect the health of tropical communities.
C) Tropical communities are low in altitude, whereas temperate and polar communities are high in altitude.
D) Tropical communities are generally older than temperate and polar communities.
E) More competitive dominant species have evolved in temperate and polar communities.
Answer: D
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Unicellular and simple multicellular organisms isolate and eliminate waste materials by:
A. moving the wastes into a contractile vacuole and eliminating them through exocytosis. B. filtering the wastes through specialized filters in the plasma membrane and into the extracellular space. C. secreting wastes into excretory tubules that connect to the outside of the cell. D. filtering the wastes into a collecting tubule and then selectively reabsorbing key solutes prior to excretion. E. All of the answer options are correct.
The functions of vascular tissue in plants include
_____ physical support of the plant. _____ photosynthesis. _____ transport of water. ______ transport of minerals. _____ transport of organic compounds. _____ transport of gametes.
Many garden plants that are grown for leaves or roots, such as parsley and carrots, produce vegetative growth the first year and reproductive structure growth the second year. Thus, what type of plants are parsley and carrots?
A) annuals B) biennials C) perennials D) woody plants
The process in which neighboring cells influence the development of each other, either by direct contact or by production of chemical signals, is called
A. maternal determinants. B. induction. C. neurulation. D. gastrulation. E. homeotic pattern formation.