Option B is correct.
B. shared; atoms
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Answer:
B. shared; atoms
Explanation:
Covalent bond is formed by sharing of electrons between two atoms. In this way full outer shell is achieved by both the atoms. Since there is no gain or loss of electrons, no ions are formed in the process.
It is usually formed between the atoms of similar electronegativity. It can be of many types like sigma bond, pi bond etc. If a pair of electrons is shared, it's a single bond. If two pairs are shared, it's a double bond and if three pairs are shared, it's a triple bond.
Photosynthesis primarily happens in the chloroplasts of plant cells, especially in the leaves. However any green part of the plant containing chloroplasts can participate in photosynthesis.
Photosynthesis generally occurs in the chloroplasts of plant cells. These are the organelles where light energy is converted into chemical energy, the process we know as photosynthesis. The chlorophyll molecules, which give plants their green color, are located within the thylakoids of the chloroplasts and play a crucial role in capturing sunlight for photosynthesis.
Chloroplasts are typically found in high concentrations in the plant's leaves, which are themselves organized to maximize light absorption. This is why the leaves are usually the main site for photosynthesis in a plant, but photosynthesis can also occur in any green parts of the plant, including stems and un ripened fruit, meaning any parts where there are cells containing chloroplasts.
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B) probably the primitive organism on the left
C) it is certain that the two organisms lived at the same time
D) it is foolish to even speculate about the relative age of the fossils
Answer;
B) probably the primitive organism on the left
Explanation;
The first living organisms we have proof of thanks to fossils, are three and a half billion years old.
Organisms which possess simple body organisation are called primitive organism. They differ from so called advanced organisms as all the activities of life are performed by a single cell.
Primitive organisms do not change their body design so easily as advanced organisms do. Prokaryotes are considered to be primitive forms and eukaryotes are the advanced organisms.
Advanced organisms are complex and have acquired new features morphologically and anatomically by evolution from simpler organisms to better adapt the changing environmental conditions.