God made Adam, the first man, from the dust of the ground (Gen. 2:7) and He made Eve to be a help meet for him. People lived much longer than they do now; the oldest man in the Bible is Methuselah, who lived 969 yrs (Gen. 5:27). The Flood came in Noah's days because man was doing "only evil continually"; so God saved only Noah and his family because "Noah found grace in the eyes of the Lord" (Gen 6:8). We also see in Heb.11 that Noah was a preacher of righteousness. That's only a little bit; try reading Genesis to get all the info you need about early man. I hope this helps you!
A leech is classified as an annelid
That your body is fighting the infection
The Hardy-Weinberg principle is used to characterize the distribution of the different genotype frequencies in a population which are not evolving. In the Hardy-Weinberg equation,
the frequency of the homozygous dominant genotype is denoted by ;
the frequency of the homozygous recessive genotype is denoted by ;
the frequency of the heterozygous genotype is denoted by 2pq;
the frequency of the recessive allele is denoted by q;
the frequency of the dominant allele is denoted by p.
It wants you to explain why its a chemical change. Signs of chemical changes are formation of gas bubbles, cloudyness, change in color or odor.