Specialized cells are formed when cells differentiate - this is true. When you have stem cells, you're talking about undiferentiated cells with no specific roles in the body. When these cells start differentiating and assuming different roles, they are also becoming specialized.
Carbon is Carbon so it's just one atom.
Air is mostly O2, N2, H2O and ....
Salt is NaCl and not one atom ;)
The negative changes which results in the lower survival rate or reproductive sucess.
<span>the principle of uniformitarianism states that the natural laws and processes that are currently utilized have always been used in the past and apply everywhere in the world.</span>
Answer: The nephridium (plural nephridia) is an invertebrate organ, found in pairs and performing a function similar to the vertebrate kidneys (which originated from the chordate nephridia). Nephridia remove metabolic wastes from an animal's body. Nephridia come in two basic categories: metanephridia and protonephridia.
