Because it allows only certain substances to permeate. If it was totally permeable that would be good enough to having no barrier as it would let everything though. Totally impermeable means that nothing would get through.
Answer:
Mutalism
Explanation:
Mutalism is when both species benifit
Polar bodies are considered byproducts of oogenesis. They are lacking cytoplasm and are much smaller than a regular egg cell. Typically they disintegrate after meiosis. It is unlikely for the resulting zygote to become a healthy embryo because the polar body was never meant to get fertilized. Therefore it is most likely lacking nutrients, and does not have the necessary resources for a healthy baby to develop.
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The characteristic that fish and invertebrates share is that they both can lay eggs.
<h3>INVERTEBRATES:</h3>
Invertebrates are a group of animals that do not possess a vertebral column also known as a backbone or spine, which results from the notochord.
Invertebrates include insects, crustaceans, arachnids, myriapods, mollusks etc.
Fishes, on the other hand are aquatic animals classified under the phylum vertebrata meaning that they possess a backbone.
However, one similarity between fishes and invertebrates is that they can both lay eggs (oviparous mode of reproduction).
Learn more about invertebrates at: brainly.com/question/480297
