Select the elements that have 4 valence electrons. hydrogen (H)

krypton (Kr)

strontium (Sr)

carbon (C)

oxygen (O)

tin (Sn)

The is an estimate of the fewest number of organisms a population needs to avoid extinction. this measurement will most if the number of offspring each female in the population produces increases. if the population's this measurement will most likely increase. 1 population density, minimum viable population, carrying capacity 2 decrease, be unaffected, increase 3 death rate increase, dead rate decrease