Marvin predicts that if marigold flowers are planted around a group of tomato plants, then fewer insects will eat the tomatoes. Which of the following observations would best support Marvin's prediction? A count of 20 insects before marigolds are planted and 20 insects after marigolds are planted. A count of 20 insects before marigolds are planted and 12 insects after marigolds are planted. A count of 10 tomato plants before marigolds are planted and 5 tomato plants after marigolds are planted. A count of 10 tomato plants before marigolds are planted and 15 tomato plants after marigolds are planted.

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.

the answer is d.) potassium