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We can say that biodiversity is a factor in maintaining life on this planet.

An intertidal species of seastar helps to maintain the diversity of the intertidal region by controlling the mussel population. Without the seastar, the mussel population would crowd out other species and take over their territory. The seastar could be called a(n)

The steps in the scientific investigative process are always followed in the same sequence by every scientist, without fail.

Strip cutting of timber is a method of harvesting that

Between 2008 and 2050, the non-Hispanic white population in the United States is expected to drop from 66% to 46%.

A chemical element cannot be broken down into simpler substances by chemical means.

A relationship in which both species benefit is best labeled

The decline in approximately 70% of the world’s bird species is particularly alarming to scientists because

In the northwest Atlantic Ocean, a domino effect after cod and sharks fisheries were fished out caused the loss of

The United States Endangered Species Act offers protection only for species located within United States boundaries.