How many hearts does an octopus have?

What type of cell undergoes meiosis

Which best describes an adaptation that could be found in a fish that lives in a slow-flowing stream? the ability to attract prey by glowing extra gills, for oxygen extraction the ability to grow larger extra fat, for warmth

Pluto was once classified as a planet. however, scientists no longer classify pluto as a planet. which is a likely reason for this change? the original hypothesis about pluto was supported. no observations of pluto were made in the past. several planets in outer space were found to be similar to pluto. there were significant changes in scientific knowledge about planets.