Explanation:
Tests for gases
Hydrogen, oxygen, carbon dioxide, ammonia and chlorine can be identified using different tests.
Hydrogen. A lighted wooden splint makes a popping sound in a test tube of hydrogen.
Oxygen. A glowing wooden splint relights in a test tube of oxygen.
Answer:
The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group. There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine). A DNA molecule is composed of two strands.
All microscopes have lenses. Some types of lenses are eyepiece lenses, objective lenses, and condenser lenses.
<em><u>Answer:</u></em>
<em><u>epipelagic zone</u></em>
<em><u>Explanation:</u></em>
<em><u>The epipelagic zone is home to most organisms because it is the sunlit upper layer of the ocean. it is also know as the photic or euphotic zone</u></em>
