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This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..
Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
This lesson explores the impact of biosecurity threats, and why they need to be identified and managed. Examples to incl..
Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..