I'm timed. I need answer as soon as possible. Will mark the brainliest if correct and ad a thanks with a rate of 5 too. thank you :) .
Which greenhouse gas has an average lifetime in the atmosphere of a few weeks to thousands of years and is the largest contributor to climate change?

carbon dioxide
methane
nitrous oxide
fluorinated gas

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

What will happen to the amount of food available as a pondwater ecosystem ages

Ts assignment - snow day assignment genetic variation and natural selection natural selection relies on genetic variation. in any population of beetles, there are alleles for brown or green color. what happens to the genotype and the phenotype of the beetle population when there are distinct advantages and disadvantages due to color? order the steps that take place during natural selection in this beetle population.