What is the trophic level of the robin in this food chain? oak tree → caterpillar → robin → fox?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Number and variety of living organisms includes genetic, species, and ecological types

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?