A)sustentacular/sertoli cells are stimulated by fsh to release androgen binding proteinb)interstitial/leydig cells are stimulated by lh to release testosteronec)androgen binding protein and testosterone are both required to stimulate sperm production (spermatogenesis)d)b and ce)all are true

The term equestrian relates to which animal? bulls cows horses pigs

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?