Answer:
B
Explanation:
Neurotransmitters such as acetylcholine, epinephrine are important at a neuron-neuron junction called synapses. When an impulse reaches the end of one neuron, at the synapse, it causes the release of neurotransmitters from synaptic vesicle that diffuse across the synapse and when they bind to their reports on the other end. An impulse is then generated on the subsequent neuron that travels down the axon to the next synapse.
Firstly, the skin is physical barrier that prevents the unchecked entry of any foreign materials into the body. Secondly, due to the secretions on the skin, the skin has an acid ph that also inhibits the growth and proliferation of pathogens. Thirdly, immune cells such as Langerhans and dendritic cells are able to access the skin and invoke the an immune response in case of infection.
Answer:
Density, dispersion, growth
Explanation
Population refers to the total number of all members of a species occupying a particular area or habitat at a given time. Populations are not static but change in size, structure and organization. Some of the characteristics of population are:
- Density which refers to the number of members of a species per unit area or volume.
- Dispersion refers to the spread and distribution of individuals of a species within a habitat.
- Growth is the rate of increase or decrease in the number of individuals in a population which is balanced by birth rate and death rate.
The issues that affect population include competition, predation, emigration, diseases and parasites.
Answer:
Minerals always occur in nature, they are solid and are inorganic. They have a crystal structure and each mineral has a unique chemical composition. I'm sorry but I don't know what the relationship between the enzymes and minerals is called.