What is hemoglobin??-_- answer and get lost from here dont dare to do any comment ?
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Providing immunity by injecting the body with a weakened form a pathogen is known as

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

Individuals do not compete directly for resources, but are prey for the same predator