The fluid-filled membranous sacs in a skeletal muscle cell that serve as storage for calcium ions are termed the sarcomeres Zlines myofilaments sarcoplasmic reticulum sarcolemma

The most effective regulator of blood pH is which of the following? the renal system the respiratory system the digestive system the buffer system

5. A factory is dumping wastewater into the river that feeds a nearby lake. The populations of lake plants and animals will likely

7. The European rabbit (an herbivore) was introduced to Australia in the 1800 s. It has no natural predators in the continent and breeds very quickly. Which of the following is a negative impact that resulted from the introduction of rabbits to the Australlan ecosystem?

How does a developing fetus change in the third trimester? A. It becomes male or female. B. It grows in size. C. It grows hands and feet. D. It develops eyes.

4. If a farmer over-hunted a population of insect-eating birds, what immediate change would likely be seen in his land?