Where are earth's most diverse and productive biomes located?
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a. in drought-tolerant areas
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b. in the tropics
c. far from the equator
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d. where there is permafrost
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Earth's most productive and diverse biome is presented "in the tropics".

Explanation:

More diversity is present in the tropical rainforests. Because the tropical rainforests receive the maximum rainfall with greater average temperature. Hence, the biodiversity near these biomes are maximum. Large amount of the flora and fauna are found here, even though the nutrient of the soil is not good as the regular rainfall washes away the nutrients so the nutrient content is low. These tropical rainforest are present near the equator  they are countries like Latin America, Brazil, Pacific Islands and south East Asia etc.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.