What is the main purpose of scientific models?
a.
the main purpose of models is to have a physical object to which to refer.
b.
the main purpose of models is to represent observations.
c.
the main purpose of models is to study systems that no longer exist.
d.
the main purpose of models is to gain a better understanding of the world.

Asegment of dna that codes for rna and a protein is a

Find the mass of the cone using the triple beam balance. a. 543.0 g b. 542.0 g c. 504.28 g d. 502.8 g select the best answer from the choices provided a b c d

Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.