As blood volume decreases, blood pressure . If greater than of the blood volume is lost from the blood vessels, the division of the autonomic nervous system (ANS) is activated, bringing about vasoconstriction of blood vessels, increased heart rate, and force of heart contraction in an attempt to maintain blood . These processes are effective in maintaining blood pressure until approximately of the blood is lost. Blood loss greater than this amount results in insufficient blood within the blood vessels, and blood pressure decreases to levels unable to support life.

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For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity