Answer: Interventional Study
Explanation: When a treatment group is compared to standard (control) group it is called Interventional Study
Under normal conditions it is not toxic
Adding ammonium nitrate to water turns the mixture cold and is a good example of an endothermic chemical reaction
The immune system. It produces antibodies which fight the bacteria or virus that caused the infection
Answer:
Males fertilize masses
of
eggs laid in the water by females.
Explanation:
fertilization is a reproductive process
