Adrian is a researcher who works in a lab. He decides to perform an experiment to understand the side effects and benefits of drinking tea. He puts forth some questions about the experiment. They include, Do people who drink tea have a higher risk of brain illnesses than non-tea drinkers? and Do people who drink tea stay more alert than non-tea drinkers? He also proposes a question, Are people who drink tea happier than people who don’t drink tea?

Adrian is performing a research based on co-relational research design which allows him to use various variables and compare the relationships and patterns existing between them.

Explanation:

Co-relational studies include case-control studies and observational studies.

Adrian is researching about the benefits and side effects of drinking tea. To support his theory, he collects evidence based on questionnaires provided to people. He questions about the alertness and happiness level after drinking tea and about risks of getting brain illness with drinking tea. He will co-relate all the results obtained and will conclude his research about the benefits and side effects of drinking tea.  

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.