Answer:
Option B
Explanation:
The food chain is as follows -
grass -> aphids (small grazing insects) -> ladybugs (carnivorous beetles) -> toads -> snakes
The grass is the primary producer while the snake is the tertiary consumer.
Grass is consumed by grazing insects, which is then consumed by carnivorous beetles. Carnivorous beetles is eaten by toads which is turn is fed upon by snake.
Hence, option B is correct
Answer:
Since school test prepares the child mentally of how his or her annual examination will look like. They help a child to evaluate him or herself by pointing the mistakes. These also enable a child to know will be coming his or her way in exams hence they can understand how to tackle pressure in such situations.
Explanation:
Longitudinal Study - A longitudinal Study is research that is carried out over long periods of time, often decades. During this period, subjects (people) are studied through repeated observations to evaluate development trends across extended periods of time. Advantage of this method is that they are valuable in identifying patterns and trends over time, ensure a clear focus and provide a high accuracy in detecting changes. However, this kind of research is very time consuming and expensive.