Answer:
There are about 300 different types of species, but we've not explored even more than 50% of the ocean
Explanation:
Answer:
B
Explanation:
Commensalism is a type of symbiotic relationship in which one species benefits, while the other species is neither harmed nor helped.
Since ponds are typically shallower than lakes, this allows more sunlight to reach pond plants than lake plants. By getting my sunlight, these pond plants can photosynthesize more efficiently.
Oxygen, water, some type of resources to build, and food to eat
The alveoli are lined with mucus and are surrounded by a network of blood capillaries. They have very thin walls for gases to be absorbed through. An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly.
