Astudent conducted an experiment that used two rose plants to determine if a liquid formula for fertilizer was better than a dry formula. he tested each fertilizer on a single plant for one month, and he concluded that the liquid formula was better. when he described his conclusion to his teacher, she told him he needed to conduct additional trials. the teacher most likely asked for additional trials because

Ans.

In an experiment, conclusion can be made only after verifying all the results various times as difference in experimental conditions can leads to change in results.

As in given experiment, the student tested fertilizers only in a single plant and gave conclusion, but the result may change if  he performs that same experiment in a different plant or in a different experimental condition. Thus, his teacher most likely asked him for additional trail because 'it is necessary to observe data from various plants before making an conclusion that can be accepted.'

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )

the correct answer is b