Answer: Scientists believe that about 25 of the known elements are essential to life. Just four of these – carbon, oxygen, hydrogen, and nitrogen– make up about 96% of the human body. Six common elements that are important in living things are carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus. These large molecules make up the structures of cells and carry out many many processes essential to life.
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Answer:
9:02:05 am
Explanation:
The time the cars will travel is equal assuming they started and stopped at the same time
Distance = Speed × Time
Distance between them is 7 km
Time it takes them to meet is 125 seconds or 2 minutes and 5 seconds
So, the time will be 9:02:05 am
Answer:
d. image is real is incorrect.
Explanation:
plane mirror always forms virtual and erect image, it can't be real because the image is not formed by the actual intersection of the rays.
Hydroelectric dams convert the gravitational potential energy of falling water into electricity.