All birds have an opening known as a cloaca that serves to remove the wastes produced by the digestive and urinary tracts. many bird species also use the cloaca during reproduction. in this process, male birds release sperm directly into the cloaca of a female bird. the sperm travel up the oviduct of the female bird and to the ovum, which it can penetrate and fertilize. the paragraph above describes

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.active transport involves transport proteins, and facilitated diffusion does not.facilitated diffusion involves transport proteins, and active transport does not.active transport requires the expenditure of cellular energy, and facilitated diffusion does not.

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen