Why is the structure of dna called a double helix? a. because each of the curved dna subunits appears twice whenever it appears b. because dna is made of two strands of nucleotides wound together in a spiral. c. because two copies of dna are inherited, one each from the mother and father d. because the number of copies of dna doubles with each round of pcr submit for grading save and finish later?

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Modern whales developed their traits through natural selection what occurs during the process of natural selection

Fruit bats in central america eat bananas and other fruits. banana plants rely on bats for pollination. what would be the most likely consequence on the banana crop if fruit bats were eliminated from the area? the banana crop would increase because bats would stop eating the crops. the banana crop would decrease because bats would no longer pollinate the crops. the banana crop would remain constant because bees would replace the bats. the banana crop would remain constant because the plants would adapt using asexual reproduction.