Please help 7 Although cells come in many sizes and shapes, they all must maintain homeostasis. Which of the following is part of homeostasis? A. obtaining nutrients and getting rid of wastes B. allowing variable sugar or salt levels C. tolerating uncontrolled growth D. enduring erratic gain or loss of water​

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

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 big bang theory suggest that the universe is about - 300 million years old - 4.6 billion years old - 30 billion years old - 13 billion years old