The answer is: " a gradient " .
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Answer:
A natural selection
D Plate techtonics
Explanation:
Movement of the plates over Earth’s surface is termed plate tectonics. Plates move at a rate of a few centimeters a year, about the same rate fingernails grow.
The idea that organisms can evolve by micro and macro evolution is a fact. However there is no definite factor to what produces evolution.
Natural Selection is a theory because it is backed by observable evidence but is not considered the definite cause as to why organisms can evolve due to surrounding debate
Answer: The correct answer for the fill in the blank is A) Physical.
Maturation refers to growth like, goal oriented, and adaptive changes in the organism throughout their life. As growth is related to physical development of the individuals, therefore maturation corresponds to physical development.
Emotional development is concerned with regulation of feelings or emotions at different situations that is how an individual manages feelings. Cognitive development is related with mental development ( like thinking, analyzing) and social development means ability of getting socialized ( that is interacting with others).
Thus, A) is the right answer for the blank.