The increase in osmolarity as filtrate moves down the descending limb is due to moving out of the tubule.

your answer should be c) enjoy!

you know they are heterozygous for a trait because they have it as jj or jj.

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive