In the steady flow, when the cross-sectional area of the tube decreases, the density of the streamline...?

d

explanation:

i think the answer is d. but im not sure!

the answer is mosques. they are an important part of islamic culture.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.