18. What is the maximum temperature for holding cold, potentially hazardous food? A. 32 degrees farenheit
B. 40 degrees farenheit
C. 41 degrees farenheit
D. 70 degrees farenheit

I believe the correct answer is C.  41 degrees Fahrenheit.

Explanation: Time and temperature are the most essential elements for monitoring the growth of disease-causing bacteria in food. The temperature danger zone lies between 40 degrees Farenheit and 140 degress Fahrenheit.

Hope this helps! ^^

b) mutualism

hope this : )

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.