Answer:
The Skeletal system helped him move his hand away from the hot object.
Explanation:
The Skeletal system consists of our skeleton or the bones. The other options would be correct if the question asked about the<u> nervous system</u> instead of the skeletal system.
Answer:
The fossils in the lower layers are older than the fossils in the upper layers.
Explanation:
The building blocks of lipids are one glycerol molecule and at least one fatty acid, with a maximum of three fatty acids.
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It changes because the age increases
