She could only observe a nucleus in a eukaryotic cell. Prokaryotic cels do not have a nucleus, but the eukaryotic cell does.
Plants will start to be able to live in warmer climates. Um get bigger root systems.
Answer:
Finally, the chemical messenger is taken back into the presynaptic neuron, ready to be used again. As levels of the neurotransmitter in the synapse decrease, the stimulation of the postsynaptic nerve ends.
Explanation:
The synapse is the space between two neurons. Through this space, neurons communicate.
An action potential causes the release of neurotransmitters from the presynaptic neuron; if there are enough of these specific neurotransmitters to bind to receptors on the postsynaptic neuron, they do and an action potential is now generated on this neuron.
This communication between two neurons must end once it's happened. In order for it to end, the synapse must be free of neurotransmitters. One mechanism to do so is for the neurotransmitters to be taken back into the presynaptic neuron.
<u>Answer:</u>
<em>Predator-prey and herbivore-plant relationships are crucial in shaping communities. </em>
<u>Explanation:</u>
<em>It is the predator species in area that checks the number of prey species in a certain geographical area.</em> More the number of predator species in an area less is the number of prey species in the area.
Similarly the geographical location of preys will depend on the geographical location of predators. <em>Preys tend to flee away from the location of predators. Plant-herbivore relation is also similar.</em>
The number of herbivores checks the number of plants in an area. In the absence of herbivores and predators the <em>number of prey species and plants will exceed beyond limit. </em>
For the purposes of this discussion, a neuromuscular junction is a synapse between a motor neuron and a skeletal muscle.
The correct order of a signal being transmitted across a neuromuscular junction is as follows:1. The brain must first send the signal to the muscle that it must move.2. The muscle must then be stimulated by a motor neuron. In other words, the stimulatory impulse must travel from the motor neuron to the muscle via the synapse.
<span>If the command or signal is correctly sent and received via the neuromuscular junction, the muscle will move otherwise the muscle will not move as the brain signal indicated. </span>
