a plant that lacks tissues for carrying water, food, and nutrients

a procedure carried out to carefully observe, study, or test something in order to learn more about it

a measure of the number of waves that pass a point in a second

a scientific explanation of the structure of atoms and how they interact with other atoms

too small to be seen without using a microscope

the breaking down of rocks on Earth's surface into smaller pieces

the regular rise and fall of the ocean's surface, caused mostly by the moon's gravitational pull on Earth's oceans

a diagram that shows that energy is lost at each level in a food chain

the state of matter in which a substance has a definite volume but no definite shape

a flowering vascular plant whose seed are surrounded by a fruit