The climate changes on Earth tend to be self-amplified. For example, the Earth is currently going through a warming trend. As the Earth’s temperature rises, the ice caps and sea ice melt, reflecting less solar radiation. This results in more absorption of the Sun’s heat, causing the Earth’s temperature to rise more, and the ice to melt more. This is an example of what type of system?
A) a neutral feedback system
B) a negative feedback system
C) a positive feedback system
D) a no feedback system

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed

How does secondary succession differ from primary succession?