WILL GIVE BRAINLSIT!!! What are the environmental challenges facing cave organisms? Explain how some organisms meet these challenges.

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explanation:

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it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .