Why is it important for egg and sperm cells to join in fertilization? Why can't an egg or a sperm cell alone develop into a new individual?

Which of the following fields of study relates to the way that human cultures govern and make laws, including laws about the environment?

Sal drips some neurotransmitter onto the dendrites of a single neuron. After extensive and careful study, Sal determines that the neurotransmitter has no affect of any kind on this neuron. What could best account for the neuron's unresponsiveness?

If earth rotated on an axis that was not tilted, how would this affect the seasons?

Tears and mucus membranes would be a part of which defense system? view available hint (s) tears and mucus membranes would be a part of which defense system? innate internal defenses adaptive defenses innate external defenses

Phenylketonuria (PKU) is a recessive genetic disorder. If both parents are carriers, what is the probability of this couple having a child with PKU? What is the chance of this couple having two children with PKU?

What passage carries food between the pharynx and the stomach?

Coiled tube in which the greatest amount of digestion and absorption take place

Most of the world's food supplies comes from 14 species of crops. Which of these crops are the most important? A) corn, potatoes, and hay B) wheat, rice, and sugarcane C) alfalfa, rice, and wheat D) grasses, bananas, and beans

Tryptophan is an amino acid necessary for E. coli survival and growth. E. coli contain genes coding for enzymes that synthesize tryptophan. These genes are grouped together on a segment of DNA called the tryptophan (trp) operon.

Why does it make sense that the sensors and controller of body temperature reside in the brain? A. Because the brain enables the body's response to temperature changes B. Because deep inside the brain is considered the body's core C.