B. sexual selection, which alters allele frequencies in the gene pool.
The main cause of extinction on Earth today is, Humans, we are the biggest
threat to our environments'.
Hope that helps!!!! ( We Humans, are our biggest enemy, and threat to ourselves, and he environment.).
Answer:
Hydrogen bond
Explanation:
<h3>The covalent bonds between the oxygen and the hydrogen atoms result from a sharing of the electrons. This is what holds the water molecules themselves together. The hydrogen bond is the chemical bond between the water molecules that holds the mass of molecules together.</h3><h3>hope the answer was helpful, mention me as brainliest.</h3><h3 />
