Select the correct answer. Pacemakers maintain the heartbeat in people who suffer from certain defects. The function of an artificial pacemaker is to send electrical impulses that will contract the heart muscles and regulate the pumping of the heart. Which condition could be corrected by a pacemaker? A. The individual’s sinoatrial node ceases to function. B. The individual’s central nervous system fails to signal the heart to contract and relax. C. The individual’s arteries are blocked. D. The valves in the individual’s heart cease to function.

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

What is the compliment dna strand to the following sequence: ttgactaggcta

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?