Hormones are produced primarily by ________

After learning to knit a simple scarf with her grandmother's guidance, Alexis began to knit a sweater while on break from college. She went over to her grandmother's once when she had a question

By the time Alexis had to go back to school, she had nearly finished the sweater. She finished the sweater a few weeks later while she was back at college, needing only one Skype session to help her. After finishing the sweater, her grandmother mailed her a pattern so she can knit a handbag. This illustrates ___________________. a. selective attention b. synaptic pruning c. scaffolding d. hypothetical-deductive reasoning

The amount of physical energy in a sound wave determines its:

a. Complexity b. Pitch c. Amplitude d. Frequency