1.
you are studying an evergreen tree that produces cones. the tree is a(n)
(1 point)
• angiosperm.
• gymnosperm.
• gametophyte.
• monocot.

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

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.