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Use the diagram to identify the four regions of the earthworm.
Dorsal side:
Ventral side:
Anterior end:
Posterior end:

See the Diagram as attached below-

Explanation:-

External Anatomy of the Earthworm is as mentioned below-

Dorsal Side- This side constitutes the top part of the Earthworm body. This part is darker than the remaining body part.

Ventral Side- The Earthworm’s bottom body part is the ventral side and this side is lighter in colour than the upper side.

Anterior side- The Head region is the anterior region of the Earthworm. It can be located by bump at its mouth.

Posterior side- The Tail constitutes the posterior region. Anus of the Earthworm forms the Posterior side.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d