Samantha plans an investigation in which she will study a population of animals. which of these answers best describes the focus of samantha’s study?

the cats and dogs at a local animal shelter

a single cat that lives in her house

all of the pets owned by her classmates

all of the cats in her neighborhood

carbon atoms, hydrogen, oxygen, and nitrogen.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.