Read the observation, question, and hypothesis. Then, choose the independent variable from the list. Observation: Bread seems to turn moldy faster in summer than in winter. Question: Do hotter summer temperatures turn bread moldy faster? Hypothesis: Bread turns moldy faster at higher temperatures. The independent variable is

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.

when it is at an intermediate population density

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.