Answer:
So that plant life doens't die out.
They can exchange both matter and energy, exchange energy but not matter, Isolated systems can exchange neither energy nor matter.
In a closed system only energy can be exchanged; matter stays inside.
In a open system matter and energy can be exchanged
Oswald Avery used chemical analysis to show the genetic material in bacteria is DNA.
Cotyledones in dicot and endosperm in monocots.
•cotyledon
-is the first leaf that germinates
—
-it is filled with stored food that the plant
uses before it begins photosynthesis
—
-some plants have 1 cotyldon (monocot) some have 2 (dicot)