Which feature is shown only by higher invertebrates, as compared to lower invertebrates?
ca. bilateral symmetry
cb. true coelom
cc. three germ layers
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Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. what could he have done to increase the validity of his data? reduce the number of plants. remove the 1 hour group. add a 0 hours control. measure the oxygen in liters

Blood, made up of red and white blood cells, work together to form

You arrive late to a biological seminar. however, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. immediately, you know that they are talking about a: ]