Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

convalent bond :

is a chemical bond formed by the sharing of electron between 2 atoms.

it is the direct chemical bond between 2 atoms.

in bond formation atoms are involved here.

electrovalent bond:

is a chemical bond defined as electroststic attraction between 2 atoms.

it is the electrostatic attraction between 2 atoms.

in bond formation, ions are involved here.

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and ur welcm

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2b2t

explanation:

2b2t

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.