I PUT THIS AS 20 POINTS SO PLEASE HELP! :(

Male elephant seals are five to six times heavier than females of the species. The males use their large body size to fight for control of groups of the smaller-sized females. Fights between two male elephant seals usually last only a few minutes, with one of the males backing off and the other establishing itself as the leader of a group of up to 100 females. What resource are male elephant seals competing for during these conflicts? food shelter mates water

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

Need will mark ! which features are created by groundwater erosion and deposition? check all that apply. a. stalagmitesb. sinkholesc. rillsd. stalactites e. gullies f. rivers

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection