Which pair of characteristics would you use to place a fish in one of the three fish classes: agnatha, cartilaginous fishes, or bony fishes?
a. skeleton type and skin covering
b. fertilization method and respiration type
c. heart type and fertilization method

Are these strong bases, neutral, strong acids, weak acids or weak base household bleach (ph=12.6) fluid in a car's battery (ph of less than 1.0) milk (ph=6.7) stomach contents (ph=2.2) pure water (ph=7)

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

What form of anesthetic was used for field surgery