Vertebrates developed about 550 million years ago. The oldest vertebrate fossils are those of FISH with no jaws. These e<span>arly jawless fish did not have paired fins and their bodies were covered with heavy, bony scaled, but their skeletons were made of cartilage. For the next 50 million years, they were the only vertebrates.</span>
They both contain DNA but in prokaryotic cells, the DNA isn't in a membrane-enclosed nucleus but is found floating in the cytoplasm. They both also have cell walls
<span>A. Direction of fibers </span><span>
Smooth muscles are also called visceral muscles because they are mostly found surrounding the different organs of the body. These muscles serve as cushion or protections for organs that are mostly found within the abdominal cavity. Unlike skeletal muscles, this muscles move involuntarily, or on their own. They are composed of bundles of specialized cells capable of contracting and relaxing to create movements, like the process of the small and large intestines during digestion, and the function of the rectum during excretion. </span>
Answer:
False
Explanation:
Large and polar molecules need to pass through ion channels since they cannot pass through the cell membrane on their own.
