The tropical rain forest biome is characterized by:
a. high density of plants, but nutrient poor soil.
b. high density of plants and nutrient rich soil.
c. low density of plants due to nutrient poor soil.
d. low density of plants, yet nutrient rich soil.
e. intermediate density of plants and intermediate nutrient supply.
a
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Spore germination followed by cell divisions results in the production of
a. a sporophyte. b. an antheridium. c. a zygote. d. a gametophyte.
The highest rates of reproduction would be expected in which of the following countries?
a. United States b. Germany c. Nigeria d. Argentina e. Russia
The four main catagories of large biological molecules present in living systems are
a. Proteins, DNA, RNA, steroids b. Monosaccharides, lipids, polysaccharides, and proteins c. Nucleic acids, carbohydrates, monosaccharides, and proteins d. RNA, DNA, proteins, and carbohydrates e. Proteins, nucleic acids, polysaccharides, and lipids
SAR11 bacteria are now thought to constitute about ________% of all microbial life on earth.
A. 75 B. 10 C. 5 D. 25