Answer:
A common birth defect that is usually due to an extra chromosome 21( trisomy 21) .
The Answer Is C) Chloroplasts. Hope This Helps.
<span>Adenine bonds with Thyamine Guanine bonds with Cytosine and vice-versa</span>
The two are blood and lymph
<h2>Operational </h2>
Explanation:
The operational definition is the description of a specific process, or set of validation tests, accessible to more persons than the definer (i.e., said to be publicly accessible), where it can be repeatedly measured or tested
Operational definitions are also used to define system states or (nonspecific) physical objects by the description of a specific process of preparation which can be repeated
For example in the given example experimenter is using the case of hitting a punching bag to measure the level of aggression in someone