Ronald wakes up feeling tired and with a headache. his physician suspects he may have sleep apnea, a sleep disorder. to make a proper diagnosis, the doctor uses a(n) to view ronald's brain while he is sleeping.

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

How many types of rock can form from the rock cycle

In which layer do organisms on earth love?