What is the effect of a mutation? no change to the dna of the organism positive change to the organism negative change to the organism

How does using straws hurt the sea turtles?

The energy needs of a human population are not affected by

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.