Answer:
a mucus or a gelatinous sheath
Explanation:
Most species of cyanobacteria are enclosed in a gelatinous sheath which is made up of proteins.
Stem cell are important because stem cells represent an exciting area in medicine because of their potential to regenerate and repair damage tissue .
Answer:
I think that it's A.
Explanation:
It's not D, because A & C contrast each other.
Answer:A bat has a much more flexible wing structure. It is very much like a human arm and hand, except it has a thin membrane of skin (called the patagium) extending between the "hand" and the body, and between each finger bone. Bats can move the wing like a hand, essentially "swimming" through the air.
Explanation:
