In the life cycle of ferns, the multicellular female gametangium (the sex organ that contains an egg) is a(n) __________.

Soils, water, and the atmosphere are major components of the abiotic (nonliving) environment. Describe how green plants affect the abiotic environment in ways that are advantageous to humans.

Compare and contrast the effects of removing growth factors from asynchronous cultures of human cells that are normal and those that are cancerous.

In the life cycle of a fern, the multicellular male gametangium (the sex organ that produces sperm cells) is called a(n) __________.

To examine meiosis in ferns, you would study __________.

The "dots" on the underside of a fern frond are spore cases; therefore, what is true of the plant to which the frond belongs?

Where would you find a fern gametophyte?

Fern gametophytes are __________.

In sporophyte ferns, the leaves are __________.