The placenta and umbilical cord act as a life support system. What role do they play in the healthy development of the fetus?​

Asap brainliest will be which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.

In which of the following relationships is one organism always benefited while the other organism is always harmed

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)