Down;s syndrome is also known as trisomy 21 because it is caused by an additional copy of chromosome 21. The correct answer is the third one: 21st.
<span>The food chain describes who eats whom in the wild. Every living thing—from one-celled algae to giant blue whales—needs food to survive. Each food chain is a possible pathway that energy and nutrients can follow through the ecosystem.</span>
Answer: Oxidation
Explanation: Hope it helps
Explanation:
The model only shows the sensory pathway of the reflex arc and does not show the motor pathway. The neuron loop / circuit is incomplete and therefore it does not show how Zoe would react to the nail in her leg.
When the sensory pathway carries the signal to the brain about the pain in the leg, the brain process the information and sends feedback to the muscles through motor neurons ‘telling’ the muscles how to react. The motors' neuron causes the muscle to contract in such a way that the leg moves away from the nail.
C. The Sun rotates about it’s axis at a predictable rate is the true statement, the rest are false statements.
