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The beginning of the Eocene Epoch Era.
Answer:
Directional selection
Explanation:
Directional selection is a type of natural selection that favors one extreme phenotype of a genetic trait due to its survival and reproductive advantage to the individuals over another extreme phenotype and the intermediate phenotype.
In the given example, the thick-leaved plants are better adapted to a drier climate due to reduced water loss. Directional selection favored the plants with thick leaves which in turn produced more progeny. Over the generations, the population evolved into the one having more number of thick-leaved plants.
The volume of the gas expansion is 0.71 liters.
<h3>
Boyle's law</h3>
Boyle's law states that the volume of a given mass of a gas is inversely proportional to its pressure provided that temperature remains constant.
P₁V₁ = P₂V₂
where;
- P₁ = 30 psi
- V₁ = 0.35 liters
- P₂ = 1 atm = 14.7 psi
The volume of the gas expansion is calculated as follows;

Learn more about Boyle's law here: brainly.com/question/469270