<span>A cell with a large surface area or with microvilli (which increase surface area) are specialized for absorption. Many cells have different protein markers on their surface to accept certain specific hormones and allow them into the cell, like muscle cells reacting to adrenaline. Muscle cells are long and able to contract, allowing for overall muscle contraction and body movement. </span>
<span>I guess the hormone part I mentioned applies to chemicals; endocrine cells produce hormones that other cells would not. </span>
<span>For organelles, muscle cells don't have many of the organelles that other cells do because of their very specialized functions. </span>
<span>I hope this helps, it would literally take volumes of text books to answer this question completely.</span>
Because particles move randomly, molecules tend to move
across the membrane in both directions. Yes, the model indicates that the molecules are moving
in equal amounts in both directions. This calld the state of equilibrium where
the forward and backward movements are equal hence the net movement is equal to zero
C is correct rock layers and fossils (:
The niche of a clown fish is to live among the tentacles of a sea anemone and it is immune from its stings. The clown fish protects the anemone from the butterfly fish. Also, the waste of the fish works as a fertilizer.
