what does the increase in incidents of polar bears visiting human settlements indicate

1 answer:

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The correct answer is "limited prey is driving the bears to seek food in human settlements".
Due to the warming of the Arctic waters, the ice is melting, resulting in a serious decline of floating winter ice. Polar bears need these floating parts of ice to hunt, therefore this new situation limits the hunting opportunities of the bears. That is why polar bears are driven to human settlements to look for food.

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When a pigment molecule in a light-harvesting complex absorbs a photon of light, what happens to its excited-state electron?.

MA_775_DIABLO [31]

When a pigment molecule in a light-harvesting complex absorbs a photon of light, While returning to its ground state, the electron transfers some of the energy from its excited state to an electron in a nearby pigment molecule.

It takes a photon of light energy some distance before it reaches a pigment molecule like chlorophyll.
An electron in the chlorophyll is "activated" by the photon. The energy imparted to the electron then moves from one pigment molecule to another until it reaches the reaction center, a pair of chlorophyll a molecules.
An electron in the reaction center is then excited by this energy, causing it to break loose and travel to the primary electron acceptor.
Therefore, it is said that the reaction center "donates" one electron to the main electron acceptor.

learn more about light-harvesting complex here:

brainly.com/question/7025086

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