Clams and snails are in the phylum ___.

Process by which substances (lead, mercury, PCB, DDT) become more concentrated in the higher trophic levels of a food web.

An underground horizontal stem.

The stigma, style, and ovary are parts of the __.

Angiosperms, the flowering plants, have an enclosed seed.

The regulation of salt and water balance is known as ___.

All blood cells are produced in the ___.

The most common population distribution pattern is random.

Plant structure formed by maturation of the ovule that contains a sporophyte embryo plus stored food.

In the vascular plants, the haploid gametophyte generation is dominant.