PLESE ANSWER FAST AND PLEASE BE RIGHT!! :) We have already lost some 80 percent of the coral reefs in the Caribbean over the last three decades, and losses in the Pacific Ocean are also widespread. Reefs are like cities, with some parts growing and some parts being destroyed.
When the net growth is positive, reefs can persist. Amazingly, coral reefs are threatened by such atmospheric
conditions as
A)the growing hole in the ozone.
B)carbon dioxide emissions and global warming.
C)increases in UV radiation and the amount of reflected light
D)increased particulate matter resulting in decreased UV rays.

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

Twin boys have girlfriends one of the couples have a baby would the dna of the lil baby be the same as the couples dna bc the boys are identical twins

Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b. passive c. facilitated d. active b. passive