Which conditions are necessary for natural selection? Check all that apply.

Populations do not have genetic variation.
Populations have genetic variation.
The environment changes.
The environment stays the same.
Organisms must have specific traits in order to survive and reproduce.
Organisms with any traits will survive and reproduce.

(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?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

What is the approximate time of death of the body temperature is 29.4 degrees celsius