When a horse and a donkey mate, they produce infertile hybrids called mules. According to the species concept, horses and donkeys are . View Available Hint(s)for Part A biological; different species biological; the same species ecological; the same species ecological; different species

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.