Name 3 unique features of the phylum echinodermata.

They are exclusively marine animals, the organisms are spiny-skinned, and they are triploblastic and have a coelomic cavity.

Explanation:

They have a star-like appearance and are spherical or elongated.

They are exclusively marine animals.

The organisms are spiny-skinned.

Explanation:

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.