Answer:
resources in ecosystem is limited
Decrease as a result of having less food to eat
The sun gives energy to producers or plants. Then, the herbivores that eat the plants. After that the first level consumers eat the herbivores. Then the second level consumers eat the first level consumers, then so on. This might seem like there is a lot of energy from level to level. But, only 10% of each level goes to the next level. The other 90% is used for energy.
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Answer:
Explanation:
There are a few key structural differences between plant cells and animal cells.
Below are a few of the main ones:
Plant cells are generally larger than animal cells.
Only animal cells have lysosomes (however, recent, and controversial, research suggests that some plant cells may have lysosomes), and only plant cells have chloroplasts.
While plants cells have a rigid cell wall, animal cells have a thin and flexible plasma membrane.
Plants cells have a large central vacuole and animal cells have many small vacuoles
Answer:
Secondary
Explanation:
There are several levels of prevention. You might confuse this with primary prevention. Primary prevention is preventing infection, so it has to be done before the patient caught the disease.
The needle-exchange program aims to reduce the spread of blood-borne disease(HIV, hepatitis, etc) from the multiple usages of the same needle. Since the disease already exists, this will be secondary prevention.