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<span>Valence
is the number of electrons an atom must gain or lose in order to complete
its outer energy level or have a stable octet in its outer shell.
In the first energy level it can have only 2, but later levels can have 8, that is, an octet.</span>
Answer:
Density-dependent factors are defined as the biological factors which are utilized by the population as a resource for example- food and shelter. Charles Darwin uses the concept of density-dependent factors in his Theory of Evolution to show how it affects population growth and mortality.
Charles Darwin used factors like competition, predation, and parasitism in his Theory of Evolution. He explained that habitats are limited by space and resource availability, and only the fittest organism will survive the competition.
Predator-prey relationships create density-dependent limiting factors and balance the ecosystem with limited organisms. If predators will increase in an ecosystem it will decrease the population of prey and after a certain time there will be a shortage of food as they are limited resources.
<span>For a 20 month old child, a nurse may look for extremes in behavior to determine if the child is being abused. This includes being distant from parents or avoiding them, or being overly clingy. The child may act out or yell at any contact, or inconsolably cry beyond the point of a regular tantrum.</span>
Answer:
As we can see from the graph above, brightly colored guppies would only survive in environments without predators, as they have worse camoflague thanks to their bright tail fins. In an environment with predators, guppies with plain/not brightly colored tail fins would survive better, seeing how while even placed in the predator's sight the guppies were less likely to be attacked when not brightly colored.
Answer:
An earthworm is a tubular, segmented worm of the phylum Annelida. They occur worldwide and are commonly found in soil, eating live and dead organic matter.
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