The continental crust is? a. formed from quickly-cooled lava b. made of rock 200 million years old c. up to 70 km thick d. composed of mostly basalt

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

One of the purposes of transcription is to produce a sequence of bases that

Which of the following would most directly interfere with sperm production? ingestion of a substance that mimicked inhibin interruption of sustentocytes' production of abp low sperm count use of synthetic steroids (testosterone)