- 1 The theory died out.
- 2 The theory is in the early stages of its development
- 3 This theory has been alive a long time.
Theories Are People (w.r.t Life Cycle)
-- 1 A new theory was given birth.
-- 2 The theory was dead and buried.
-- 3 The theory was eventually retired.
Theories Are Plants (w.r.t. Life Cycle)
-- 1 This theory is withering on the vine.
-- 2 This theory is still productive.
-- 3 This theory is past the time when it can bear fruit for us.
-- 4 The theory grew out of their earlier work.
-- 5 The theory was a natural outgrowth of their work.
-- 6 Many theories sprang up out of the fertile soil of his discoveries.
-- 7 The theory was nourished by later experimental results.
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