What gases are responsible for most of the pressure exerted by the atmosphere on the surface of Earth?

How do the sperm cells get from the stigma to the ovules?

Explain the function of a vacuole in plant cells?

Me ! which of the following is an environmental concern of genetically modified foods? a) crops that are drought resistant are introduced providing food regardless of the unpredictable weather b) reduction cost of production for the crops c) an important ingredient may be introduced in a strain of rice for the poor who depend on rice as a primary food d) toxic substances produced as a pesticide may be consumed by unintended species