Select the correct answer.
which observation did researchers make in studies on separated twins?
a. separated twins develop traits that differ according to the environments in which they are raised.
b. separated twins tend to have the same behavioral characteristics, regardless of environment.
c.
although separated twins share behavioral traits during their early development, the environment might suppress such traits later.
d.
environmental factors play a more dominant role than genes do in shaping an individual's behavioral traits.
e.
certain physical traits of separated twins differ due to environmental influences.

A. Separated twins develop traits that differ according to the environments in which they are raised.

Explanation:

Despite sharing exactly the same DNA, identical twins can have completely different personalities. Until now, researchers did not know exactly by what mechanisms individuals overcame their genetic programming and differentiated themselves throughout life, forming their individuality. However, after some research, the scientists concluded that the environment has some influence on the personality of the twins. They believe that identical twins who were created separately have different personalities due to the influence of the environments.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.