When you rub your hands together on a cold day, you use friction to convert
a. mechanical energy into thermal energy
b. thermal energy into nuclear energy
c. nuclear energy into electrical energy
d. electrical energy into electromagnetic energy

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.

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

1. which of the following is correct regarding opiates/opioids: a. they all have a natural component as a starting pointb. they have low addiction possibilitiesc. methadone binds to some of the same receptorsd. a and care correcte. all are correct