Common symptoms of iron deficiency anemia muscle weakness, shortness of breath, and lightheadedness. Why does iron deficiency cause these symptoms?

vascular tissue transports materials from the environment into the plant.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

option a and d is the correct answer

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explanation: