Ineed this really !
a scientist discovers a new species and compares its embryos to the embryos of several different mammals. the new organism doesn’t have pharyngeal arches, or a, notochord, and it doesn’t go through the carnegie stages of development. from this information, what can the scientist conclude?

a. it’s not an animal.

b. it’s not a mammal, but it’s a different type of vertebrae.

c. it’s a vertebrae because it’s a mammal.

d. it’s not a mammal or a vertebrae.

The answer is D: It's not a mammal or a vertebrae

Explanation:

Vertebrate embryos have pharyngeal arches, a notochord, a dorsal nerve cord, and a postanal tail.

d

Explanation:

Vertebrate embryos have pharyngeal arches, a notochord, a dorsal nerve cord, and a postanal tail.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.