Answer:
Naturally acquired immunity
Explanation:
Naturally acquired immunity is the immunity developed by an individual from a previous exposure to a pathogen or disease. This confers future protection on the individual from acquiring the disease
Answer:
C. calcium ion levels.
Explanation:
Calcium enters the axon terminal during an action potential,
Answer:
Plant-eating animals are called PRIMARY CONSUMERS.
Explanation:
In an ecosystem, consumers are heterotrophic organisms that can not make their own food. They rather depend on producers or other consumers for food and nutrition. The organisms that derive their nutrition directly from plants are called primary consumers. They are also called herbivores as they feed on plant and plant products. For example, deer graze grasses. This makes deer a primary consumer and a herbivore.
I believe that the seismograph shows the difference of time between the arrival of the two types of waves and this can be read right off the seismograph recording. Also, to get the distance of the earthquake from the recording spot one can derive the average velocity from Vp x Vs/Vp-Vs=km/sec x difference in time of arrival of the two equals the distance to the epicentre, This is where Vp = velocity of P wave and Vs = velocity of S waves.
