Because when under the light the ph tend to change through electricity
Answer:
100x − 200y = 600 and x + y = 12
Explanation:You can win the quiz show with 600 points. Remember that correct responses are worth 100 points and incorrect responses are worth -200 points. So, you need your total points from each correct response, x, minus your total points for each incorrect response, y, to equal 600:
100x − 200y = 600.
If you only respond to 12 questions, you need the total number of correct responses, x, plus the total number of incorrect responses, y, to equal 12:
x + y = 12.
Together, these two equations describe one way you can win.
1.
The first prokaryotic cells (the less complex in its organization and with no organelles involved in membranes) evolved about 3.5 billion years ago. Therefore, the correct answer is D. 3.5 billion.
2.
Then, some prokaryotic cells evolved to use the sunlight to produce energy and release O2 into the atmosphere about 2.8 billion years ago. Therefore, the correct answer is C. 2.8 billion.
3.
After that, the prokaryotic cells evolved to cells with organelles bounded by membranes, and then the eukaryotic cells evolved about 2.5 billion years ago. Therefore, the correct answer is B. 2.1 billion.
4.
A long time after that, aproximately 650 million years, the first life composed of an organism with multiple cells evolved. Therefore, the correct answer is A. 650 million.
Answer:
wrapping the electrical cord around the microscope
Explanation:
i took the test
