Natural selection could not occur without?

the answer to you question is   jet streams

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

thinking it would be physical characteristics

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.