Explain the environmental impact humans have on the aquatic ecosystem of the retaining pond. Be sure to mention both positive and negative impacts.

Most enzyme names end in the

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.

The diagram shows a chicken embryo and a human embryo