Which specialized cells act as a barrier to protect tissues within the body? epithelial cells neurons red blood cells smooth muscle cells

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 glowingextra gills, for oxygen extractionthe ability to grow largerextra fat, for warmth

How many types of rock can form from the rock cycle

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from