Which statement best describes the central nervous system? a. its senses stimuli and carries out a reaction b. it secretes hormones. c. it is made up of all nerve cells d. it is made up if brain and spinal cord

Rotenone is an insecticide that is toxic

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of

This is the interaction of two organisms where one is and the other is neither nor harmed.