Ohio Achievement Test Coach Science, Grade 5 10. Bob first blows whistle hard. Then he blows the same whistle gently. What
changed when Bob blew the whistle the second time?
POSTTEST
A pitch
B. volume
C. pitch and volume
D. frequency

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.