C 3
2
What are the names and functions of the structures labeled 1 and 2?
O 1 - testicle, produces semen; 2 - epididymis, carries sperm
O 1 - scrotum, produces sperm; 2 - urethra, carries semen
O 1 - scrotum, protects testicles; 2 - testicle, produces sperm
O 1 - urethra, carries sperm; 2 - testicle, produces sperm

1. the is the thinnest part of the earth. 2. the is the thickest part of the earth. 3. what metals are mentioned in the text?

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.