A marine scientist is studying photosynthetic organisms, which use sunlight to produce their own food. She observes that they tend to populate shallower ocean depths. She concluded that photosynthetic organisms can only live in areas of low pressure why is this a invalid scientific conclusion

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.

What is the next step in muscle contraction after the actin changes shape

Why is it bad that some cancer cells can make their own growth hormones?