What effect do keystone species have on an ecosystem?
A. They destroy habitats.
B. They maintain biodiversity.
C. They cause primary disturbances.
O
D. They make weak species extinct.

How will technology impact medicine in the future?

(drag each tile to the correct identify which questions can be answered by what can be answered by science or which cannot. -is it right or wrong to use genetic engineering to produce new food products? -what are the most common social settings that tend to produce accomplished artists? -if a new gene is added to the genome of a tomato species, will that species be more resistant to insects? -should humans use biotechnology to bring extinct organisms from the fossil record back to life? -do the types of organisms found in the fossil record appear in consistent sequences in different parts of the world? -are michelangelo's paintings more impressive than rembrandt's?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?