For CPP, since it is a more selective and impacted campus, you need to be in the 3800 EI range for a solid chance at an acceptance especially an impacted major. Zoology is an option under the Biology major so you apply as a Biology major with an option in Zoology. You are still considered a Biology major.
https://www.calstate.edu/sas/documents/ImpactedProgramsMatrix.pdf
The minimum EI of 2900 is to apply to any CSU campus, not the minimum to be considered a viable applicant at each campus.