Short answer - to breathe.
Long answer - the black streaks on the trunk of birch trees are called lenticels, and their function is to enable the exchange of gases between the tree and the air. So, in a way, this makes the whole process of photosynthesis a lot easier for birch trees.
Answer:
When monarchs eat the milkweeds,they become toxic to other animals because the milkweeds carry toxins in them that only they can eat. Also some milkweeds can help cure their disease and parasites to make them uninfected.
Explanation:
I'm not entirely sure why holistic treatments would be controversial in
animals. Perhaps what makes them controversial is the fact that we tend
to assume we know what makes them holistic and how they will be holistic
for the animal - this isn't necessarily the case, as we can only make a
good guess about it.
The answer should be testable
Below are supposed to be the choices:
A. water flows in a lake or pond but never flows in a wetland.
<span>B. Wetlands are nesting areas for birds, but lakes and ponds are not. </span>
<span>C. Water does not always cover a wetland as it does a lake or pond. </span>
<span>D. Wetlands are salty, but lakes and ponds are fresh.
</span>
The answer is C. Hope it helps.
