Answer:External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air. Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells.

Explanation:

7 0

3 years ago

Some scientists estimate that over half of the world's rainforest has already been lost, mostly due to human activities. What wo

Anna35 [415]

Answer:

Less oxygen. Less life.

Explanation:

Plants make up most of our oxygen here on earth, because of the carbon cycle and photosynthesis. They take carbon dioxide, and turn it into oxygen. And not only that, but some animals live in trees to protect themselves from birds and other animals.

7 0

3 years ago

A circle with a diameter of 16cm

jeka94

Explanation:

radius is 8 because radius is half of a diameter

6 0

2 years ago