Answer:
i don't think they have teeth
Explanation:
Answer:
The density- independent limiting factors that can affect a population include food, predation, toxic waste and environmental disasters.
Explanation:
Density independent factors like <u>natural calamities which include volcanic eruptions, hurricane, floods, earthquake</u>, etc are not influenced by population density change. For example, the current rampaging bush fire in Australia has caused a lot of damage to different animal and plant species. Many populations of species have become endangered and others are wiped off.
The quality of nutrients available in an environment affect the growth of organisms in it. The lower the quality of nutrients, the higher is the environmental stress. E.g in <em>Lake Erie</em>, the growth of algae was restricted due to the extensive presence of phosphorus in the water bodies.
Pollution is also a big reason for decrease in the density of populations. E.g Amphibians such as toad, frog are susceptible to pesticides which flow into the water bodies. It reduces their ability to <em>reproduce</em> and inhibits their growth.
When the number of predators in a given area increase, the population of <em>prey decreases</em>. Extensive predation can lead to the extinction of prey species.
A change in allele frequency can be caused by various reasons. Mutations, recombination, gene drift, gene flow, and hybridization are some of the examples. Basically anything that would cause microevolution to happen would change allele frequencies. The Hardy Weinberg equilibrium might be helpful, too.
Answer: Neurotransmitter
Explanation:
Neurotransmitter are refers to as chemical messengers, which are secreted by the nerves cells, to stimulate neighbouring neuron, thereby allowing impulses to be passed from one cell to next, throughout the entire nervous system. Neurotransmitter are released by the axon terminal, after an action potential has reached the synapse, which the is the neuron transmit signal. Neurotransmitter are often released when, electric signal gets to neuron, it triggers the vesicles that contains neurotransmitters, which will split neurotransmitters into the synapse.