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A hole in a leaf through which water and gas exchange occurs is called a _____________.

Which of the following phyla has only one extant species?

During double fertilization one sperm fuses with the egg to form a ______________ zygote while the other fuses with the endosperm mother cell to form ______________ endosperm.

A tomato is an example of ________________.

The name given to the “Mars-sized” planetary body that is believed to have hit the ancient Earth ~4.5 billion years ago forming the moon is __________.

The idea that life on Earth originated on another world, possibly Mars, is the hypothesis known as ____________________.

An extant species is one that died off in the past, like the dinosaurs.

Which of the following flower structures is male?

The Miller-Urey experiment set out to understand if simple molecules (CH4, H2, CO, CO2, NH3, N2, H2O) in the early atmosphere could react to form building blocks of life.  The experiment was able to generate _____________ and further experiments also generated __________________.

The ____________ is an example of a living fossil from the Cambrian period.