Simplify the following text for a Grade 10 native English-speaking person.
Original: Correct determination is only possible for trees which make growth rings , generally those which occur in seasonal climates ; trees in uniform non-seasonal tropical climates are always growing and do not have distinct growth rings .
Simplified: Accurate determination is only possible for trees that produce growth rings , generally those in seasonal climates . Trees in uniform non-seasonal tropical climates grow continuously and do not have distinct growth rings .