DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Which of the following conditions would biologists say was required for the evolution of DDT resistance in a population? a. A few mosquitoes in the population were resistant to DDT before it was ever used.
b. Mosquitoes in the population learned to adapt to the high levels of DDT in the environment.
c. The mosquito population needed to evolve DDT resistance in order to avoid extinction.
d. Exposure to DDT caused specific, nonrandom mutations for DDT resistance within the population.

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

c is the correct answer hope this !

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: