Life on Earth is often described as exhibiting both unity and diversity. Explain this statement
What will be an ideal response?
To explain what is meant by the unity exhibited by life on Earth, students should discuss the fact that all living things share the nine basic characteristics of life. In addition, most all cells share the same basic structure (cell membrane, nucleus, other organelles, etc.), metabolism (respiration), and mechanism for reproduction and heredity (DNA transmitted to daughter cells through mitosis and/or meiosis and fertilization). To explain what is meant by the diversity exhibited by life on Earth, students should discuss the process of evolution whereby even closely related species can become adapted to very different environments and, as a result, take on very different physical, behavioral, and physiological characteristics. It would be best if students could generate examples to illustrate this principle.
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Which phylum harbors the MOST functional diversity observed and also has the MOST cultured representatives?
A) Actinobacteria B) Bacteroidetes C) Firmicutes D) Proteobacteria
In Wilms' tumor,
A) heart cells divide as frequently as do cells in the skin. B) being exposed to cigarette smoke in the uterus causes lung cancer in infants. C) cells in a child's kidney divide as frequently as if they were still in a fetus. D) deletion of the retinoblastoma gene causes an eye tumor.
What happens when rocks are newly exposed (or created) in an area?
a. k-selection b. r-selection c. primary succession d. secondary succession
__________ is a concentration of nerves and sensory structures at the head end. Fill in the blank(s) with the appropriate word(s)