Answer:
Variation, Overproduction, Adaptation, Descent with Modification
Explanation:
Variation: Heritable differences that exist in every population are the basis for natural selection.
Overproduction: Competition between offsprings for resources.
Adaptation: a trait that helps an organism survive and reproduce
Descent with Modification: Natural Selection will result in species with adaptation that are well suited for survival and reproduction.
A trophic level is each step in a food chain that demonstrates the transfer of energy.
A trophic level is any feeding level in a food chain through which energy in the form of food is transferred in an ecosystem. A food chain contains five main trophic levels which are; (i) primary producers (autotrophs; plants and algae), (ii) primary consumers (herbivores), (iii) Secondary consumers (carnivores and omnivores), (iv) Tertiary consumers (carnivores and omnivores) and (v) Apex predators.
Answer:
B) Valence electrons
Explanation:
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