O Level Biology MCQs – Certification Test 679

Excretion in Biology MCQ (Question 679) – App & e-Book Download

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MCQ 679: For excretion, animals with impermeable skin use:

simple diffusion process
produce concentration gradient
special excretory glands
special excretory organs

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O Level Biology MCQ App & e-Book – Excretion in Biology Certification Guide

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