Simple Multicellular Organisms That Are Small Can Meet Their Gas

question 118

Multiple Choice

Simple multicellular organisms that are small can meet their gas exchange needs by means of:

• A)a flattened body shape that increases their surface area
• B)a flattened or thin body shape that reduces the distance between cells inside their body and the external environment
• C)by living in air that provides abundant oxygen, even though they are at risk of losing water and drying out
• D)by living in water so that they do not dry out from water loss, even though water has less oxygen per volume than air
• E)by relying on anaerobic respiration (glycolysis)for long time periods, so that they don't need to use oxygen for aerobic respiration

---

Definitions:

Natural Selection

The process by which organisms better adapted to their environment tend to survive and produce more offspring, a key mechanism of evolution.

Galápagos Islands

The Galápagos Islands are an archipelago of volcanic islands located in the Pacific Ocean, renowned for their unique and diverse ecosystems which played a significant role in the development of Charles Darwin's theory of natural selection.

Disruptive Selection

Outcome of natural selection in which the two extreme phenotypes are favored over the average phenotype, leading to more than one distinct form.

Directional Selection

Outcome of natural selection in which an extreme phenotype is favored, usually in a changing environment.