1.In some plants (like lilies), all four megaspores survive. Three megaspores fuse into a single nucleus while one megaspore remains solitary. Then both of these nuclei go through two mitotic cell divisions to form the typical eight nucleus megagametophyte. One nucleus from each group join to form the polar cells. After fertilization by a sperm, what would the ploidy of the endosperm of a lily be

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

As a result of climate change earths temperature is rising and sea ice is melting what is a likely effect? answer : populations of walruses and polar bears will decline