Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?​

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

Overtime the pond slowly becomes more acidic due to the release of chemicals from a nearby factory. which of the organisms would most likely survive the change to their environment?

Which is the most likely reason the writer of the play pygmalion chose to change the character of galatea from a statue to working-class woman?