Answer:
Salt is a mineral/substance that is made up of sodium chloride. It is typically used as a food ingredient and a nutrient. There are different types of salt such as kosher salt, table salt, sea salt, smoked salt, etc.
Circulatory system isn't correct. Circulatory is the system that circulates blood. Therefore B is out.
C, respiratory, is not it. The respiratory system is responsible for inhaling oxygen and exhaling carbon dioxide.
The integumentary system is basically skin, in which protects our more sensitive body parts that allays underneath the skin from various potential harmful factors.
A should be the answer, because kidneys are like filters and separators. Separating needed things from waste and extra bodily fluid that would later be at disposal.
Answer:
it has 10,000 mcg per 1 ml
1. Yes because the ocean takes in the carbon dioxide from the air. This causes more acid in the water, this makes it hard to make shells and skeletons for the seal life that need them.
2.No because it isn't harmful unless it builds up. But there is people who work to clean and limit the chances of build-up.
Hope this helps :)