A biologist looks at an organism through a microscope. Which of the following observations tells the biologist that the organisms is eukaryotic?
O The organisms has a cell membrane
O The organisms is unicellular
O The organism moves with flagella
O The organism has a nucleus

O  The organism has a nucleus

O The organisms has a cell membrane

Explanation:

Eukaryotes are organisms whose cells contain a nucleus and other membrane-bound organelles. There is a wide range of eukaryotic organisms, including all animals, plants, fungi, and protists, as well as most algae. Eukaryotes may be either single-celled or multicellular.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation: