Many Species of Field Mice Are Able to Reproduce Several

question 79

Multiple Choice

Many species of field mice are able to reproduce several times a year and produce litters with multiple offspring. However, an ecologist noted that the population size of mice, as measured in a California grassland, did not change from year to year. The factors that keep natural populations from increasing are collectively called:

• A)nonliving factors.
• B)biotic potential.
• C)scramble competition.
• D)exponential growth.
• E)environmental resistance.

---

Definitions:

Pith

The innermost tissue in the stems and roots of many herbaceous plants; primarily a storage tissue.

Vascular Cambium

A layer of meristematic tissue in plants that produces vascular tissues, contributing to the thickness growth of stems and roots.

Secondary Xylem

The part of the xylem that is formed after the plant's initial growth, contributing to the thickening of the plant stem.

Primary Phloem

The part of the plant's vascular system that conducts sugars and other metabolic products downward from the leaves.