This is because all land vertebrates share a common ancestor. All land vertebrates emanated from evolution form the oceans and seas from a group categorized as Sacropterygii. Therefore during the early phylotypic stages of embryonic development, the embryos of all land vertebrates look alike morphologically. It is believed it is during this stage that the basic plan of the body takes shape before it begins to diverge.
Answer:
The common characteristics of Archaebacteria known to date are these: (1) the presence of characteristic tRNAs and ribosomal RNAs; (2) the absence of peptidoglycan cell walls, with in many cases, replacement by a largely proteinaceous coat; (3) the occurrence of ether linked lipids built from phytanyl chains and (4)
Explanation:
As the options of the question are not provided and not found therefore on the basis of previous knowledge a attempt has been made to answer the question.
Answer:
The action potential is generated in the neurons as a result of the movement of two ions mainly sodium and potassium. When the sodium gated channels open then the sodium ion move inside the cell which increases the positive charge. This causes depolarization of the neuron.
Thus, the movement of sodium ions into the neuron causes depolarization of the neuron.
1. D
2. C ( I think )
3. C. ( I think )