Explanation:
Succession is a process of gradual changes that starts where no living organisms are there. The species that inhabit in a bare area are called as pioneer species. A pioneer community is a group of organisms, that starts the process of biological succession (the progression of an ecosystem over time). These organisms are typically plants, animals, and fungi. However, the rate of ecological succession depends on various factors like natural disturbance (flood, forest fire and severe wind) and human based disturbance.
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$I$. There are many side effects of tubectomy and vasectomy
$II$. Purpose of tubectomy is to prevent egg formation
$III$. The most important component of the oral contraceptive pill is progesterone
$IV$. Contraceptive oral pills help in birth control by preventing ovulation