A fisherman needs to winterize his boat and uses a 40% antifreeze solution. How much pure antifreeze must he add to 10 liters of 25% antifreeze to make a 40% solution? Hint: pure
antifreeze is 100% antifreeze.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

b a mature ovary of a plant.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.