When a farmer crosses two different types of plants to grow one that has a desirable trait from each, this process is known as
a. agricultural manipulation.
b. genetic mutation.
c. trait farming.
d. selective breeding.

Several billion years ago which gas was the least prevailant in the atmosphere

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.

Monarch butterflies have brightly colored orange wings with black patterns on them, making them easily visible to birds that eat butterflies and moths, yet birds rarely eat the monarchs. likewise, the monarch caterpillars are brightly striped yellow and white and black, and they also are rarely eaten by birds, although some wasps will attack them and feed them to their young. what can be inferred from these observations? monarchs must threaten and attack birds, but not wasps. monarchs have a way of discouraging bird predation that does not involve hiding. monarchs’ wings are so colorful that most birds must find them difficult to eat. monarchs lay more eggs than other less conspicuous butterflies.