Which of these sentences characterizes the regulatory mechanisms of gene expressions in organisms? . . a. they the organism to utilize all the metabolic resources inside their body completely, which sometimes may lead to lack of metabolites.. . b. they save energy and metabolites and the organisms to respond to the environmental changes.. . c. they utilize a high amount of energy, always lead to catabolic processes, and may lead the organism to exhaustion..

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.