<span>One of the reasons PCB's have been hard to clean up from the puget sound is because they stay in the food chain. Once something is inside an animal it becomes much harder to remove from the environment than if it was just in water.</span>
When a cell divides, c) each daughter cell receives its own copy of the parent cell's DNA.
Answer:
Pluto and comets
Explanation:
The two objects in space formed from the huge disk of ice and debris beyond the outer planets are Comets and Pluto.
A Comets is made of dusty ice and they are known to orbit the sun. Comets are also known to contain gases such as carbon dioxide, water, methane and ammonia. Pluto is the farthest planet away from the sun. It also contains ice and some amount of dust which validates the chosen option.
Chemical and gaseous exchange takes place only across capillary walls
Sorry for the late answer but I hope that's still help !