Why are blood cells so far apart, while skin cells are grouped closely together

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

Most of earth’s fresh water is found in oceans and seas stored in glaciers and ice caps groundwater stored beneath the surface found in lakes, rivers, streams, and reservoirs

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?