Option b is correct..
Caves are formed by the dissolution of limestone. Rainwater picks up carbon dioxide from the air and as it percolates through the soil, which turns into a weak acid. This slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.
I believe:
Restriction Enzymes, and DNA Ligase
These enzymes cut n paste DNA, to produce a molecule of recombinant DNA, such as the red fluorescent gene used in ABE. These enzymes are used in the first step of DNA Cloning.
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Explanation:
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Approximately one billion oxygen molecules. that is because there are about 250 million molecules of haemoglobin in each cell, and each haemoglobin molecule binds to 4 oxygen molecules
