Human sperm cells and egg cells are
a haploid, which containing 23 chromosomes
b haploid each containing 46 chromosomes
c diploid each containing 23 chromosomes
d diploid each containing 46 chromosomes

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.

Match each medication with its description.

Ineed a little . why do you think there is a basic difference between the kinds of fertilization most common in aquatic and terrestrial animals?