The answer is B) Genetic variation
They are not able to reproduce independently
They do not use energy for metabolism of any kind
<span>Their virulence is maintained by non-living cultures
Hope this helps. ^.^</span>
Answer:
When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron.
Explanation:
The binding allows the nerve impulse to travel through the receiving neuron.
Sympathetic nervous system is activated in this situation.
This branch of nervous system is activated when any individual encounters stressful or dangerous situation.This is responsible for 'fight or flight' response.
It takes place by activating adrenal gland which releases specific hormones adrenaline and nor adrenaline also called as catecholamines . These hormones are responsible for the appropriate physiological response to the situation.
The danger of blood collecting inside the pericardial sac after blunt chest wall trauma is that: the heart cannot contract as effectively.
