Which of the following experiments follow ethical standards? a.)performing test on animals when the information can be obtained in other ways. b.) experiments done to people who cannot protect themselves. c.) releasing contaminated contaminated waste into the water system. d.) research on animals in which the animal in which the animal experiences no fear or pain.

D.) Research on animals in which the animal experiences no fear or pain.

Explanation:

It is ethical to perform test on an animal such that the animal experiences no fear or pain.  

It is unethical to perform test on an animal when some other tests can be performed without the animal to get the desired results.  

Polluting the water resource with contamination is an unethical practice.  

People who are vulnerable cannot be subjected to experiments.  

i think a, hope it .

explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.