Which of the following statements is true? a)during active transport, a material may be moved from an area of low concentration to an area of high concentration. b) during passive transport, energy is used to move material against a concentration gradient. c)during active transport, water is pumped across a membrane to equalize the concentration of salts on both sides. d)during passive transport, osmosis allows salts to move from one side of the membrane to the other to equalize concentrations on both sides.

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

Does mitochondria still meet the definition of a eukaryote why or why not?

Draw the structure of dna nucleotide with adenine as nitrogenous base