Chloroplasts are most commonly found in the green (mesophyll) cells of photosynthesizing plants. Any part of a plant that is green is capable of photosynthesis and therefore contains cells containing chloroplasts.
Answer:
every answer of yours is correct
If the gradient or slope is high then the water flow will go faster because suppose water is flowing down from a skateboard ramp, it would flow faster than water flowing throw a straight pipe.
Here's a picture I drew to help you!
Also viruses have nucleic acid whether DNA or RNA nucleic acid, they are so minute that you can't observed them,
it's letter C, they are also responsible for proteins. their cell wall is made up of capsid.