PLEASE HELP!! If the sperm cell is unable to enter the egg cell when they meet, this is which of the following reproductive barriers? A. posy-zygotic isolation B. temporal isolation C. gametic isolation D. mechanical isolation​

Answer plexus is a network of interlacing nerve fibers in the peripheral nervous system (pns);

Wind speed, 2. length of time the wind has blown, 3. fetch. period of the wave;   answer . given a wave f(x, t), we call period t the interval of time we need to wait before the form of the wave is repeated. obviously, we must choose a constant x and observe the wave passing trough it. for exemple, for. f(x, t) = e i(kx - wt) . it's. f(x, t + t) = e i(kx - w(t + t)) ,. so that we have. 0 = f(x, t + t) - f(x, t) = e i(kx - wt) (e -iwt - 1) â e -iwt = 1 â t = n 2ï/w,. with n element of z. if we are considering two near peaks of f (that is a good way to define t) n = 1, and we have the famous. t = 2ï/w..hoped i !  

Ans'hypertension;