Cacti grow in the desert, which is a very hot climate. Not the best for both gaining and maintaining water supplies, due to the fact that water becomes vapour very quickly in conditions such as a desert (unless we're talking about polar deserts).
Keeping their stomata closed during the day stops water vapour from escaping their cells. While this does inhibit growth and stop new water molecules from entering, it allows the cactus to maintain a healthy amount of water within itself.
About 37.2 trillion cells present in the body of an adult human.
The answer is D: solar energy is a renewable source
Important muscle electrical signals is the movement of charged material (ions) across cellular membranes in a limited area
Yes. Knowing which nucleotide base codon the amino acids is made of, you can "decode" amino acids to the original DNA sequence.
