When did plants first appear on earth? How do we know this?
What will be an ideal response?
The first land plants were believed to have become established between 500 and 425 million years ago during
the Ordovician period. This is also the period of time when invertebrates, such as arthropods and worms,
appeared on land. These first terrestrial invertebrates fed on decaying plant material.
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Bacteria that work without oxygen are called _____
a. protozoa c. one cell b. anaerobic d. aerobic
Another culprit that shortens the life of cut flowers is the naturally-occurring plant hormone ____
a. ethylene c. acetylene b. styrene d. polystyrene
The aesthetic qualities in a commercial building are generally built into the overall design of the building, rather than applied after the shell is erected.
Answer the following statement true (T) or false (F)
How does a closed expansion tank work?
A) Air is trapped at the top of the tank B) The walls of the tank are made of a flexible material C) The top of the tank is open to the atmosphere D) It uses a flexible diaphragm with an air charge above the diaphragm