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A “biological annihilation” of wildlife in recent decades means a sixth mass extinction in Earth’s history is under way and is more severe than previously feared, according to research. Scientists analysed both common and rare species and found billions of regional or local populations have been lost. They blame human overpopulation and over consumption for the crisis and warn that it threatens the survival of human civilization, with just a short window of time in which to act.
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Answer:One of the most important functions of guard cells is to control the closing and opening of the stoma/pores. While the opening of these pores allows water to be released into the environment, it also allows carbon dioxide to enter the cell for photosynthesis (as well as the release of oxygen into the environment).
Explanation:
Answer: guard cells are a pair of cells that surround each of the stoma openings. to open the cells, they have to be triggered by one of many possible environmental or chemical signals. these can include more sunlight or higher than normal levels of carbon dioxide within the cell.
Explanation:
they open to regulate the gas and moisture exchange, hope that this is what you were looking for :)
Answer:
One relative of whales was Pakicetus, which lived 50 million years ago. (the group of marine animals that includes dolphins and whales).
Explanation:
I think the answer is 23
Answer:
False
Explanation:
Energy can neither be created nor destroyed. Energy can only be transferred from one form to another.