The functional connection between two bones is called a: MCQ with Answer and Explanation

Explanation:
Viruses are unique entities containing either DNA or RNA, never both simultaneously, enclosed in a protein capsid. They are obligate intracellular parasites, requiring a host cell's machinery to replicate. Despite being biological entities, they can be crystallized like chemicals, as demonstrated by W.M. Stanley with TMV. Thus, statements 2 and 3 are correct.

Explanation:
Producers (autotrophs) capture solar energy and form the base of the energy pyramid; they contain the largest amount of energy. Only about 10% of energy is transferred to the next trophic level (primary consumers). Energy decreases at each successive level, making producers the most energy-rich.

Explanation:
The tricuspid valve has three cusps and prevents backflow of blood from the right ventricle to the right atrium during contraction. The mitral (bicuspid) valve is on the left side. Semilunar valves are at the ventricular outlets.