Answer:
1.
Explanation:
Xylem cell is a plant vascular tissue that conveys water and dissolved minerals from the roots to the rest of the plant and also provides physical support. Xylem tissue consists of a variety of specialized, water-conducting cells known as tracheary elements.
2. Phloem is the vascular tissue in charge of the transport and distribution of organic nutrients. The phloem is also a pathway to signaling molecules and has a structural function in the plant body.
3. Stomata are composed of a pair of specialized epidermal cells referred to as guard cells. Stomata regulate gas exchange between the plant and environment and control water loss by changing the size of the stomatal pore.
4. Guard cells optimize leaf gas exchange in response to changing environmental conditions and their turgor is controlled by alterations in atmospheric CO2 concentration, light intensity, humidity, and the drought hormone abscisic acid.
Answer:
Homeostasis
Explanation:
Cell membranes enable organisms to maintain homeostasis by regulating the materials that may enter or leave a cell.
Alfred Wegener, is who proposed the idea of Pangaia
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How do anthropologists decide where to look for ancient humans?
In most cases, they wait for an amateur to get lucky, then make their move. Anthropologists can't see what's under the first layer of earth without digging—ground-penetrating radar isn't sensitive enough to distinguish fossils from the surrounding rock—and there's too much land and too few anthropologists to dig up every site where the geology favors bone preservation.
