Multiple choice

If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction, what should be their birth rate per snail per year?

  1. 25

  2. 15

  3. 10

  4. 9
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The population growth formula is P_final = P_initial * (1 + r)^t. 2500 = 250 * (1 + r)^1. 10 = 1 + r, so r = 9. The birth rate is 9 per snail per year.

AI explanation

The total increase in the snail population is 2500 - 250 = 2250 snails. The birth rate per snail per year is calculated by dividing this total increase by the initial population. This gives 2250 / 250 = 9 offspring per snail. The result is 9.

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