I. Acid rain II. Agricultural run-off

III. Waste-water treatment

IV. Air-born pesticides

V. Erosion of farmland

Groundwater is the source of drinking water for more than one-half of U. S. residents. As water seeps through the soil, it carries

substances applied to the land, such as fertilizers and pesticides. Water moves through aquifers, and eventually surfaces in

discharge areas, such as streams, lakes, and estuaries. It is common to think of surface water and groundwater as separate

resources but they are interconnected. Imagine your source of household water is groundwater and you want that water to be free

from contaminants and toxins. Using the illustration above, choose all the possible sources of contamination to your water.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

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explanation:

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1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.