What statement is true regarding the nervous and endocrine systems?

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

Which part of the spine is likely to cause a nerve signal to travel faster? a. backbones b. white matter c. nuclei d. gray matter