Which mineral is the main component of bones and teeth along with calcium? MCQ with Answer and Explanation

Explanation:
The Competitive Exclusion Principle, formulated by G.F. Gause based on his experiments with Paramecium, states that two species with identical ecological niches (competing for the exact same limited resources) cannot coexist indefinitely in the same habitat. One species will inevitably have a slight reproductive advantage and will outcompete the other, leading to the local extinction or evolutionary shift (resource partitioning) of the inferior competitor.

Explanation:
Edward Jenner, an English physician, is credited with developing the world's first successful vaccine against smallpox in 1796, using material from cowpox lesions. Alexander Fleming, a Scottish bacteriologist, discovered the first true antibiotic, penicillin, in 1928, from the fungus Penicillium notatum. Louis Pasteur made immense contributions to microbiology and immunology, but the double helix structure of DNA was discovered by James Watson and Francis Crick in 1953. Thus, statements 1 and 2 are correct.

Explanation:
A synapse is a specialized junction where the axon terminal of one neuron communicates with the dendrite or cell body of another neuron via neurotransmitters. The axon hillock is where action potential initiates, nodes of Ranvier are gaps in myelin sheath, dendrites receive signals.