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.

The function of the endosperm is to __.

In the flowering plants, pollination may be carried out by wind or by animals.

Which of the following structures attaches muscle to bone?

Members of this phylum have four unique characteristics including a post-anal tail, notochord, nerve cord, and pharyngeal gill slits.

The lymph nodes function to ___ the lymph.