Twins that came from two different cells that were fertilized separately are:

Correlational studies, when significant, should have a positive trend close to a +1 correlation, or a negative trend close to a -1 correlation.

The __________ refers to an individual’s physical characteristics, while the __________ refers to an individual’s genetic make up.

Vygotsky suggests that people learn and develop cognitively with the help of others. The support provided by others through guidance, and teaching is called ___________.

Atkinson and Shiffrin were notorious for:

Babies who are “inactive” and have calm reactions, however often exhibit a negative mood at first, are referred to as _____________. While babies who are adaptable and have “moderate to low intensity” emotions are referred to as ____________. And babies who have a “negative” mood, and struggle with adapting to new situations and often withdraw are referred to as _________.

Cataracts are always the cause of loss of eyesight in the elderly.

Researchers suggest that __________ influences development genetically, and therefore individuals are influenced only by what they were born with, whereas __________ is how an individual develops based on their environment and the way they were raised.

As people age into middle and late adulthood, they show physical signs of aging both internally and externally. Which of these are internal (not visible) signs of aging?

Someone outside, in the school courtyard, decided to light firecrackers, and the sound made everyone jump in the adjacent classrooms. This is an example of an: