Mitochondria is the powerhouse of a cell
Answer: The frequency of brown beetles is 0.32.
Explanation: The frequency of A1 allele is 0.8. As p+q=1, or the sum of dominant and recessive frequencies equals 1 or 100%:
1 - 0.8 = 0.2
In Hardy-Weinberg principle,

2pq represents the frequency of heterozygote individuals, so:
genotype A1A2 = 2*0.8*0.2 = 0.32.
Thus, the frequency of brown beetles (A1A2) in the population is 0.32.
If the pacific ocean was rimmed by the ring of fire we can conclude that the plate boundaries are constantly moving
Answer:
Explanation:
Earth's water evaporates, winds move water vapor from the sea to the land, increasing the amount of fresh water on land. Wind and evaporation patterns from the first animation are shown here on a map of the world. ... The ocean loses water to the air when the water
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Answer:
Marco polo worked as an administrator for 17 years.
Explanation:
Upon reaching China, Marco Polo entered the court of powerful Mongol ruler Kublai Khan, who dispatched him on trips to help administer the realm. Marco Polo remained abroad for 24 years