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>
8.3 × 10-6 meters=77 meters
Answer, =8.3=77 meters
Yes, the pterosaurs is the ancestor of the bird.
Answer:
B. bradycardia
Explanation:
Bradycardia, also known as slow heart rate, is usually slower than 60 beats per minute.
Hope this helps! :)
Answer:
Mitosis is the process in which the nucleus of a eukaryotic cell divides. During this process, sister chromatids separate from each other and move to opposite poles of the cell. This happens in four phases, called prophase, metaphase, anaphase, and telophase
