For those wanting to know what the new Snapchat emoji symbols mean, there is several different things that they repersent and these emojis have replaced the âBest Friendsâ feature with Friend Emojis smilies.
(plural tetrads) 1  A group of four things. ( 2 chemistry) A tetravalent atom or radical. ( biology) Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
A tetrapod is any vertebra organismal with four limbs. In that case humans are considered tetrapods because we have four limbs: Our two feet and arms makes us a tetra pod.Also frogs, t.rex, and mouse are considered tetra pods.mphibians, reptiles, birds and mammals are all tetrapods; even snakes and oth â¦ er limbless reptiles and amphibians are tetrapods because they descended from animals which had four limbs. Whales and other cetaceans are also tetrapods because they are mammals have two front limbs and the two hind limbs are vestiges.