the opening and closing of this structure on a plant leaf allows for water and gas exchange to occur. A) xylem B) phloem C) stomata D) guard cells

Only the fibrous layer can be observed in its entirety from the superficial surface of the cow eye. True or False

What equation has a water as a product in the chemical reaction?

Which of the following maintains the patency (openness) of the trachea? a. surface tension of water b. surfactant production c. C-shaped cartilage rings d. pseudostratified ciliated epithelium

If cyanobacteria never evolved during earth's history, how would their absence affect the composition of earth's atmosphere?

Which of these processes describes the effect earths atmosphere has on earths geosphere A. Animals losing their habitat from deforestation B. Ocean levels rising from glaciers melting C. The sun evaporating water from a lake D.

What is a tough and rigid layer that surrounds plant cells as well as some algal bacterial cells

Which of the following statements about natural selection is TRUE? A. Natural selection results in those individuals within a population who are best-adapted surviving and producing more offspring. The traits that promote survival are heritable. B.

Explain how temperature and salinity affect the formation of deep currents.

What substance is added during hydrolysis in order to break down food macromolecules?

What would happen if grasses and shrubs were removed from an ecosystem? A. the primary consumers would increase B. the primary consumers would become secondary consumers C. the primary consumers would die out or move elsewhere D.