As Part of a Research Project, a Graduate Student Creates

question 17

Multiple Choice

As part of a research project, a graduate student creates an artificial environment in a sealed container. She sterilizes the soil and adds plants, snails, shrews, and a snake. After adding a small artificial pond, she seals the container. During the first several weeks, the plants are thriving and the animals are doing well. However, piles of dropping are beginning to accumulate, and the entire floor of the container becomes covered with a layer of plant debris several inches thick. One probable cause for the problems is that the graduate student didn't

• A) add any decomposers.
• B) include any carnivores.
• C) include any herbivores.
• D) put in enough plants.
• E) include any autotrophs.

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Definitions:

Cervical Mucus

A fluid secreted by the cervix, which changes in consistency and volume throughout the menstrual cycle, playing a key role in fertility.

Female Condom

A barrier contraceptive device that is inserted into the vagina to prevent sperm from reaching the uterus, thereby avoiding pregnancy and reducing the risk of STDs.

Spermicide

A substance that is toxic to sperm.

Cervix Protection

Methods or interventions aimed at preserving the health and integrity of the cervix to prevent infections, diseases, and cancer.