A forest community is made up of thousand of species of organisms and can exist practically unchanged for hundreds of years. This stability is due to the
a. diversity of organism present
b. abundance of insects that feed on plants
c. changes in the climate of the area
d. lack of decomposers in the forest
Answer: a. diversity of organism present
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Recall that during the Paleozoic Era, atmospheric CO2 levels decreased. Why?
A. New, extensive mountain ranges formed and chemical weathering decreased. B. Earth's plate tectonics changed dramatically, and subduction increased. C. Photosynthetic, woody plants first appeared during this period. D. Volcanism decreased during this period.
Viruses were first identified:a
because they caused an infection and formed colonies on nutrient agar plates. b. because they were seen in the light microscope. c. because they caused an infection and were small enough to pass through filters that trapped bacteria. d. because they were smaller than bacteria and had all the properties of living organisms. e. because they caused an infection and were seen in the electron microscope.
In the chemiosmotic synthesis of ATP in a chloroplast, H+ diffuses through ATP synthase
a. from the stroma into the thylakoid space b. from the thylakoid space into the stroma c. from the intermembrane space into the matrix d. from the cytoplasm into the intermembrane space e. from the matrix to the stroma
The disease osteoporosis involves loss of both mineral and organic components from bones. Factors that may contribute to the development of osteoporosis include
A. lack of calcium and vitamin D in the diet. B. excess fat in the diet. C. prolonged disuse of muscles. D. a history of extreme sport participation. E. a decline in estrogen following menopause in women.