Which system recieves and sends electrical signals through out the body?
a. muscular
c. nervous
b. skeletal
d. cardiac

Chicken pox and hepatitis are bacterial diseases. true or false?

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.

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution