Which of these is an example of a good observation in a discriptive investigation? A. The monkeys spent 2hrs in one tree B. The monkeys spend most of there time in their favorite tree C. The monkeys jump around in the trees because they are playing D. The monkeys left the tree because they were hungry and wanted food
NOT CHEMISTRY ITS SCIENCE BUT THEY DON'T HAVE A SCIENCE THING

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Many pharmaceutical drugs are organic compounds that were originally synthesized in the laboratory. which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3