New Orleans is surrounded by a series of levees and floodwalls. Why were these structures built? A. to make transportation easier
B. to protect the city from floods
C. to purify the river water
D. to provide irrigation for agriculture

B. to protect the city from floods

Explanation:

it's in the name, new orleans usually floods very easily during hurricane sason because the city is submerged and uses the floodwalls to decrease the amount of water.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest