23. When the sperm cell then meets the egg, the 23 chromosomes that each sex cell have form the 46 total chromosomes that each human being has.
The effect of geographic isolation is that the two populations are subjected to different selection (pressures) and geographic conditions. The conditions in the two areas, if different, will produce different alleles in that species and will be selected for, where genetic differences will gradually accumulate between the two different populations.
In time, enough genetic differences will occur so that the two populations will no longer interbreed. Then, by definition, they have become different species.
To perform an actual<span> dissection, you will need a Dissection Kit: </span>Tray<span>, pins, </span>scissors<span>, scalpel, </span>forceps<span>, </span>goggles<span>, </span>gloves<span>, and probes. And, of </span>course<span>, a Preserved Frog.</span>
I think the answer is a or c
Answer:
Air pressure depends on how heavy the air above is. So the heaver the air above the stronger the pressure below:P
