Answer: 1. Mass and type of solution
2. Type of material
3. Temperature
The tiny holes in a sponges outer layer that take in water are called ostia, I believe. Hope it helps
The awnser is D or the 4th one
Answer:

Explanation:
In this problem, we need to convert
to km².
We know that,
1 km = 1000 m
⇒ 1 km² = 10⁶ m²
So,

So,
is equal to
.