Which of the following characteristics do most amphibians share? A. Amphibians spend their entire lives on land,

B. Amphibians lay their eggs in water.

C. Amphibians are invertebrates.

D. Adult amphibians use gills to breathe.

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.

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement

What do you need to use in order to work as an environmental scientist? you need to use the scientific method and__ in order to work as an environmental scientist.