what is the meaning when it is said that bryophytes are prostates?

Q. When a bacterium is said to be amphitrichous, it means that it has

Q. Aeroplane cabins are said to be pressurised. What that mean?

Q. It is said that :elements can't be divided into simpler parts but radioactive elements can be divided by the means of fusion
so what does that mean what is wrong

Q. What is meant by “The sun enters a nakshatra?” It is said that in the rainy season the sun enters the mrug nakshatra. What does it mean?