Primed for Survival

Periodical cicadas emerge in large numbers every 13 or 17 years, using prime number cycles to avoid predators and cross-breeding with other species. This strategy ensures their survival and preserves their unique characteristics. The use of prime numbers in their life cycle fascinates both biologists and mathematicians, as it minimizes the chance of coinciding with other species' cycles.

What is the primary reason periodical cicadas emerge in large numbers every 13 years?

• To confuse predators

• To create safety in numbers

• To ensure they have enough food

• To attract more mates

Why are prime numbers significant in the life cycle of cicadas?

• They make cicadas more attractive to mates

• They increase the lifespan of cicadas

• They reduce the chance of coinciding with other species

• They help cicadas find more food

How does a 13-year cycle benefit periodical cicadas compared to a 12-year cycle?

• It allows them to breed more frequently

• It reduces the chance of cross-breeding with other species

• It increases their population size

• It helps them avoid predators

What is one advantage of cicadas having a prime-numbered life cycle?

• They can avoid mating with non-periodical cicadas

• They can live longer

• They can produce more offspring

• They can migrate to different areas

How often would cicadas with 13-year and 17-year cycles meet?

• Every 221 years

• Every 30 years

• Every 17 years

• Every 13 years