Answer:
Because certain varieties of blue-green algae can produce toxins that are linked to illness
Explanation:
If an orderly set of steps is followed, the observations and results are more reliable.
<span>if it results in new governmental regulations on industry</span>
Answer:
Modern amphibians are characterized by the flexibility of their gaseous exchange mechanisms. Amphibian skin is moistened by mucous secretions and is well supplied with blood vessels. It is used for respiration to varying degrees. When lungs are present, carbon dioxide may pass out of the body across the skin, but in some salamanders there are no lungs and all respiratory exchanges occur via the skin. Even in such animals as frogs, it seems that oxygen can be taken up at times by the skin, under water for example. Therefore, regulation of respiration occurs within a single species, and the relative contribution of skin and lungs varies during the life of the animal.
Explanation:
Answer:
Organisms with hard parts such as a shell,or bones are much more likely to become fossilized than animals with soft parts like a worms.
Explanation:
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