The survival of a species depends on 1. An environment that never changes
2. A continuously increasing life span
3. Reproduction within populations
4. A limit of no more than populations

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.

In the controversial scientific process of cloning, organisms are created that are genetically identical to there parent. this process would be classified as