hi can you please help me with this question .

Explanation:
a) X = 2,8,1 Y= 2,8,7
b) NaCl
c) X= 1 Y = 1
d) X shoot around water
and it less dense than water so it float s on water
2)Carbon moves from the atmosphere to plants. ...
Carbon moves from plants to animals. ...
Carbon moves from plants and animals to soils. ...
Carbon moves from living things to the atmosphere. ...
Carbon moves from fossil fuels to the atmosphere when fuels are burned. ...
Carbon moves from the atmosphere to the oceans.
3)PVC is used to make pipes, polyvinyl flooring and siding, hoses, cable coatings, medical devices, and plumbing and automotive parts. It is used to make material for upholstery, housewares, shower curtains, raincoats, toys, school supplies, food packaging, and shoes.