A person who is paralyzed can use an electronic device implanted in the brain to control robotic hands. How is that possible?

When analyzing tree rings, what do scientists assume a thin ring indicates?

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels