Answer:
Variation can be acted on by natural selection.
Explanation:
Variation are the difference that exist in the organism in terms of the body size and can be acted upon by natural selection.
Natural selection could act on the owl body size, favor the selection of owl with small body size especially when resources available are limited and can only sustain small number of individuals leading to availability of owl with small body size in such area and a gradual reduction in the number of owl with large body size.
the is a definite article meaning that you cannot use it
"an" can only be used before words beginning with vowels
therefore the answer is" a"
Primary succession is ecological succession that begins in essentially lifeless areas, such as regions in which there is no soil or where the soil is incapable of sustaining life because of recent lava flows, newly formed sand dunes, or rocks left from a retreating glacier.
Parent material is responsible for the physical and chemical properties of the soil.
<h3>What is Parent material?</h3>
This is defined as materials such as rocks or organic matter which acts as the starting stage for soil development.
This material are influenced by factors such as weathering which determines the physical and chemical properties of the soil.
Read more about Parent material here brainly.com/question/1593669
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