An elements is its row in the periodic table.
1.)atomic mass
2.) period
3.) chemical symbol
4.) nuclear fusion
5.) periodic table
6.) group
7.) plasma

Which is it a characteristic of the animal kingdom? a. they include both vertebrates and invertebrates b. their skin is covered with hair or fur c. they are heterotrophs d. they are eukaryotic

According to the cladogram, which organisms have roundworms as a common ancestor?

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation