Absent from the atmosphere, often a limiting resource in marine and freshwater ecosystems. Its presence in soil is due to weathering or the physical breakup of rocks by fungal hyphae or plant roots. a. True
b. False

What type of cell is produced after fertilization occurs and the gametes combines ?

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

What is the name for a substance formed in a chemical reaction