Answer:
Heart valves or the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole and the closure of the aortic valve and pulmonary valve at the end of ventricular systole.
Explanation:
The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole.
The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.
Answer:
Interpreted for the first answer and for the second answer is instincts and reflexes.
Explanation:
Answer:
A. cause they can blend in with no snow and snow
Explanation:
The structure (shape and number) of an animal’s teeth vary according to what food they consume.
For example, molars- flat teeth at the back of the mouth are very different among different types of animals:
• Herbivores (eat plants) have strong and flat molars ,
• Carnivores (eat meat) have limited number of molars,
• Omnivores (eat combine food) have molars for grinding.
On the other hand canine teeth are small or sometimes don’t even exist in herbivores are very defined and sharp in carnivores.
Answer:
Limited food supply and competition
Explanation:
Density dependent factors are those which in general lead to reduction of growth rate of population when the population density increases. One of such factor is availability of food and competition.
Whenever the density increased to an extent where the resources or available food becomes scarce or limited,then the growth rate of population decrease. These factors generally lead to logistic growth pattern of population.
