Greg Is 10 Months Old, and He Refuses to Crawl

question 172

Multiple Choice

Greg is 10 months old, and he refuses to crawl across the visual cliff even though his mother is encouraging him to do so. When he was 6 months old, he squirmed across it without hesitation. What has changed for Greg?

• A) His experience with crawling has led him to understand that crawling over an edge affords falling.
• B) His visual system has matured sufficiently to detect depth.
• C) He has developed an insecure attachment with his mother.
• D) He must have fallen from an elevated height since his last test on the visual cliff.

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Definitions:

Ecology

The field of biology concerned with how organisms interact with each other and their environment.

Organisms

Any form of life, ranging from microscopic entities like bacteria to complex multicellular beings such as humans and trees.

Nonliving Environment

All the abiotic components in an ecosystem, including minerals, water, sunlight, and atmospheric gases, which affect living organisms.

Ecology

The branch of biology that deals with the relationships of organisms to one another and to their physical surroundings.