The tiny holes in a sponges outer layer that take in water are called ostia, I believe. Hope it helps
Seems right, but if it’s just asking for one i would pick B
I think the answer is magnetic field?
<span>35 grams
The average salinity of seawater is 35 parts per thousand, so multiply the mass of seawater provided by 0.035 and you'll get the amount of salt (mostly sodium chloride) dissolved in it. So
1000 g * 0.035 = 35 g
Therefore in 1 kilogram of seawater with average salinity, there is 35 grams of salt.</span>
