Structure. A hypha consists of one or more cells surrounded by a tubular cell wall. In most fungi, hyphae are divided into cells by internal cross-walls called "septa" (singular septum). Septa are usually perforated by pores large enough for ribosomes, mitochondria and sometimes nuclei to flow between cells.
<span>In a population of field mice, favorable traits in the mice are likely to INCREASE over time, and unfavorable traits are likely to DECREASE over time.
