Telling yourself, "I should wear what other people are wearing at the party tonight," is an example of

In class Dr. Heyman gave an example in which she had a pen and an eraser on the table. She described a young child who already knows the word "pen" but not the word "eraser". The child is then asked to pick up the eraser. The point of this example was to illustrate which of the following principles:

a. mutual exclusivity b. whole object c. the specific part principle d. using the grammatical category of a word to infer its meaning

What percentage of zygotes have an abnormal number of chromosomes?

< 1 percent 20 percent–25 percent 5 percent–10 percent > 50 percent