Explain how red blood cells become sickle-shaped . Sickle-cell anaemia

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems