Where does an avocado plant get nitrogen atoms to make protein? Air
Water
Soil
Sunlight

Which are forms of nitrogen that are usable by humans

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

~~16. while watching a special on animals, brianna discovers that hares tend to lose heat through their ears. based on this and what is known about surface-to-volume ratios, propose an explanation as to why hares that live in hot climates (such as the desert) have large, extended ears