Which phrase best defines rocks? a. objects made of crystals, minerals, water, and air b. objects made of crystals and water c. objects made of one or more minerals d. objects made of minerals and organic matter

The cluster of developing cells from conception until birth is called an

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .

Which characteristics must an object possess in order to be considered alive?