Why do some scientists believe that carbon dioxide is responsible for global warming? check all that apply. carbon dioxide levels in the earth’s atmosphere have been steadily decreasing. carbon dioxide levels in the earth’s atmosphere have been steadily increasing. carbon has a longer average lifetime in the atmosphere. carbon has a shorter average lifetime in the atmosphere. other greenhouse gases amplify the effect of carbon dioxide.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Sexual reproduction in the parent cell will result in offspring with a) identical genetic information. b) half the genetic information. c) double the genetic information. d) four times the genetic information.

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities