Humans have affected the balance of nature by: A. sleeping B. polluting C. eating

Awic dietitian is meeting with a client who has an infant and a young child. the mother says that the young child is a very picky eater and will only eat crackers and juice. the health worker notices that the child's hair is brittle, his nails tear easily, and the skin inside his lower eyelids is very pale. these are all signs of iron deficiency.

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.