Models need to be changed when a. they are based on experimental data b. scientific understanding changes c. they represent a phenomenon d. they are designed to answer a question select the best answer from the choices provided a b c d

the answer is a because if the model is based on experimental data it wont be good unless it has been tested.

B

Explanation:

scientific understanding changes

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

correct answer: false

while planning water activities, it is very important to consider the weather, because if we do not plan and are going for a surf, then it might be that the hurricane came and drown us or may carry us to long distance from where we can not come back. there are many reasons to take information about the weather when we are planning any water activities.

hence, the correct answer would be false.