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.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.