What area of the lifespan did scientists first study?

The correct answer is child development.

Explanation:

A scientific study of how and why human beings transform over the course of their life is known as developmental psychology. It was initially concerned with children and infants, however, the field enlarged to comprise adult development, adolescence, aging, and the whole lifespan.  

In the area of the lifespan, the scientists initially studied the development of a child. The child development covers the psychological, biological, and emotional modifications, which take place in human beings between the birth and the end of adolescence.  

archaebacteria are found in in forest soil.

hope i spelled it right lol

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-lavira: )

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave