Answer: B, C
Explanation: Scientists use radiometric dating of meteorites and analyze the impact craters on planetary body surfaces to learn about the age of the solar system and its planetary bodies.
A covalent bond in which the electrons are shared unequally is called a(n) polar covalent bond. The atoms of the bond have partial negative and positive poles due to unequal electron distribution.
An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. When atoms share electrons, a stable equilibrium of the attractive and repulsive forces between them is known as covalent bonding. These electron pairs are also known as shared pairs or bonding pairs. Since most interactions between carbon molecules include covalent bonds, covalent bonds are particularly significant. By sharing electrons with other molecules through covalent bonds, molecules can form extensive chains of compounds.
When atoms are distributed unevenly in a covalent connection, a polar covalent bond develops. Specifically, when the two atoms in the bond have electronegativities that range between 0.4 and 1.7. Polar covalent bonds and polar bonds are frequently used interchangeably.
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Answer:
A. Chloroplasts.
Explanation:
Chloroplasts are organelles found in leaves of green plants and they conduct photosynthesis. They contain chlorophyll pigment which captures sunlight and convert it to energy.
Photosynthesis is the process whereby green plants manufacture their food from carbon dioxide and water in the presence of sunlight and they release the oxygen.
So, in the presence of chloroplast, photosynthesis takes place and oxygen is released into the atmosphere.
