The fluid mosaic model of membrane structure suggests that membranes Question 3 options:

are composed of a single fluid layer of phospholipids and proteins

are composed of a fluid bilayer of fatty acids with proteins associated on the outer and inner surfaces

are composed of protein molecules embedded in a fluid bilayer of phospholipids

are composed of a fluid phospholipid bilayer sandwiched between two layers of hydrophilic proteins

multiply it by 5 in order for you to understand i cant give an exact answer.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.

to this one it would be receptive field

(nitrogen fixation) will be your answer sorry if im wrong