Answer: Natural variation.
Answer:
Answer:
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Primary consumers are those animals that depend on or they eat primary producers.
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Secondary consumers are those that eat mainly primary consumers.
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Explanation:
Primary Consumer: A primary consumer is an organism that directly eat primary producer ( plants). They are usually herbivores that eats autotrophic plants, autotrophic plants produce food through photosynthesis. Primary consumer are heterotrophic.
Example: Goat, cow and rabbit.
Secondary consumers: Secondary consumers depends mainly on primary consumers for their food requirement. Secondary consumers are carnivores as well as omnivores.
Example; Owls, bears, lions and humans etc.
20. The answer is 1 (Precambrian)
21. The answer is 4 (Pennsylvanian)
22. The answer is 2 (Bony Fishes, Dinosaurs, and Mammals)
23. The answer is 2 (Reptiles)
Answer:
Genetic resistance (or genetic tolerance) refers to the ability of certain organisms to endure environmental conditions that are extremely stressful or lethal to non-adapted individuals of the same species
Explanation:
