Multiple Choice
What is the primary difference between punctuated equilibrium and gradualism in evolutionary theory?
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21. Evolution
Introduction to Evolution and Natural Selection
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Which adaptation was crucial for reptiles to successfully colonize dry land?
A
Development of the amniotic egg
B
External fertilization
C
Moist, permeable skin
D
Gills for underwater respiration
Verified step by step guidance1
Understand the problem: The question asks which adaptation allowed reptiles to thrive on dry land. Consider the challenges of living in a terrestrial environment, such as water retention, reproduction, and respiration.
Analyze the options: Evaluate each adaptation provided in the question to determine its relevance to life on dry land.
Option 1: Development of the amniotic egg. This adaptation allows embryos to develop in a protected environment with a self-contained water supply, making it crucial for reproduction on land.
Option 2: External fertilization. This is common in aquatic environments but is not suitable for dry land, as it requires water for sperm to reach the egg.
Option 3 and 4: Moist, permeable skin and gills for underwater respiration are adaptations for aquatic or semi-aquatic life, not for dry land. Reptiles have dry, scaly skin to prevent water loss and lungs for breathing air.
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