What is a cast fossil? What is a mold fossil?

Mold Fossil: A Mold Fossil is a fossilized impression made in the substrate, a negative image of the organism. Mold fossils form after hard parts have been buried in mud, clay, or other material that turns to stone.

Cast Fossil: A fossil formed when an animal, plant, or other organism dies, its flesh decays and bones deteriorate due to chemical reactions; minerals gradually enter into the cavity, resulting in a cast fossil.

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answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.