What effect did an isolated environment have on marsupials? * It made the koala become the most famous and popular marsupial.
Marsupials spread all over the world so that they could survive.
There are now many different species of marsupials in Oceania.
It caused meat-eating marsupials to become extinct.

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explanation:

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.