Red squirrels and gray squirrels have been the native species on an island for many years. a few years ago, black squirrels entered this island. the black squirrel is an invasive species. invasive species aren’t native to the ecosystem. they move into an ecosystem because of natural changes or human intervention. red squirrels and black squirrels have identical food requirements, but gray squirrels have a different diet. what three effects will these events have on the island’s squirrel population? the food availability of red squirrels may increase. the red and black squirrels will have to compete for nutrition. the food availability for gray squirrels will not be affected. the food availability for red squirrels may decrease. the food availability for gray squirrels will be affected.

Looking at this image, what relationship can be drawn from it? the lower the degree of latitude, the lower the degree of temperature there is no relationship between latitude and temperature the higher the degree of latitude, the higher the degree of temperature the lower the degree of latitude, the higher the degree of temperature

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.

9. the history of life on earth is recorded in