In the past, African elephants have been hunted for their tusks. Over time, the number of tuskless elephants has increased while the number of elephants with tusks has decreased. What is the most likely explanation for the increase in the number of tuskless elephants? a
Fewer elephants with tusks survived to reproduce.
b
The gene for tusks has become recessive over time.
c
The hunting of elephants resulted in genetic mutation of the tusk gene.
d
Elephants began to lose their tusks because of climate changes.

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

(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?