I believe it is the third one, Acidic carbon dioxide dissolves in water, lowering the water’s pH.
Carbon dioxide is known to make water more acidic because once it dissolves, it forms carbonic acid. Making water more acidic means the pH is being lowered (not raised).
That is my educated guess.
How the chromosomes aligned on the metaphase plate during meiosis
Dominant traits are those that are expressed or seen when a heterozygous genotype is present. Heterozygous just means having two different alleles for a gene. One is usually dominant while one is recessive. Remember, recessive alleles are masked by dominant alleles. In humans, dark hair is a dominant trait; if one parent contributes a gene for dark hair and the other contributes a gene for light hair, the child will have dark hair.
