When is the lead male and female are given preferential treatment to resources such as food and potential mates?

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

What percentage of light hits earth's surface directly?

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates