Multiple Choice
Which term describes the oldest and most stable stage of ecological succession?
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1. Introduction to Biology
Natural Selection and Evolution
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Arrange the following phases in the partial life cycle of a star in order, starting with the earliest event:1. Main sequence star2. Protostar3. Red giant4. Nebula
A
1 → 2 → 4 → 3
B
2 → 4 → 1 → 3
C
4 → 2 → 1 → 3
D
4 → 1 → 2 → 3
Verified step by step guidance1
Step 1: Understand the life cycle of a star. Stars form from clouds of gas and dust called nebulae, which are the earliest stage in the life cycle of a star.
Step 2: Recognize that after the nebula stage, gravitational forces cause the gas and dust to condense, forming a protostar. This is the second stage in the life cycle.
Step 3: Learn that once nuclear fusion begins in the core of the protostar, it becomes a main sequence star. This is the third stage, where the star spends most of its life.
Step 4: Understand that as the star exhausts its hydrogen fuel, it expands and becomes a red giant. This is the fourth stage in the life cycle.
Step 5: Arrange the phases in order based on the explanation: Nebula → Protostar → Main sequence star → Red giant.
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