The hedgehog are animals with spiny armor that protects it from predators and cushions its falls from trees. Animals have different survival mechanisms and means to protect themselves from possible predators. For example; a Camel has long eyelashes and hair-lined ears that blocks blowing sand, can close its nostrils to keep sand out. Others like Koala uses specially designed hands and feet and a thick, padded tail to hold on to tree branches for long periods of time.
The basic structure of a cell membrane is in three parts; the internal membrane surface, the external membrane surface and the intervening phospholipid material. This intervening material is impermeable to ions and polar molecules and it prevents polar solutes likie amino acids from moving across the membrane but permits the passive diffusion of hydrophobic molecules.. The external and internal cell membranes are selectively permeable and can regulate what comes into or goes out of the cell and in so doing allows for the transport of materials needed for survival.
When the concentration of the solute is lower inside the cell than outside it
--To pump a molecule across a membrane against its concentration gradient, the cell must expend metabolic energy, which is provided by ATP. This type of membrane traffic is called active transport.--
The answer is C, cells dividing too much
