According to the graph, which renewable energy resource did the united states use most during 2007? a) biomass b) petroleum c) natural gas d) hydroelectric

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?