I think it means true skin
Answer:
I pick embryo similarities.
Explanation:
Vertebrates have a resemblance of their embryos. Such as birds, amphibians, fish, reptiles and mammals. Though there's resemblance but it doesn't form the same organism since there's evolution which might be due to geographic and ecological isolations.
Example, Amphibian embryo resemble with fish embryo.
Answer:
Explanation:Toxic materials e.g synthetics
They become even more toxic as they are converted to more toxic products by reaction with other substances or by metabolism of microorganism
Yes but also how long it can generate the force for
