Compared with rods,cones are

A) more sensitive to dim light and more sensitive to fine detail.
B) less sensitive to dim light and less sensitive to fine detail.
C) more sensitive to dim light and less sensitive to fine detail.
D) less sensitive to dim light and more sensitive to fine detail.

Although all of the objects of a culture guide children,_____ believed that language is pivotal.

A) Vygotsky
B) Skinner
C) Ainsworth
D) Erikson

It appears that stress during pregnancy can

A) reduce the mother's immune system.
B) trigger infections that can cause premature labor.
C) come from either positive or negative events.
D) All these are correct regarding stress.

Biology ________ gender.

A) causes
B) creates
C) dictates
D) influences

Each molecule of deoxyribonucleic acid (DNA) is stored on:

A) a chromosome.
B) RNA.
C) a gene.
D) a zygote.

Dr.Hugo designs an experiment to test the effectiveness of a new antidepressant.Half of the participants will receive the drug and half will receive a sugar pill,but neither the participants nor the researchers who administer the drug will know who is receiving the drug and who is receiving the sugar pill.What has Dr.Hugo designed

A)  a double-blind research study 
B)  an unethical research procedure 
C)  a study that will minimize self-report bias 
D)  an experimental study with two confounded variables