Answer:
A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.
well hope this help at least (good night)
Cacti preform photosynthesis just like any other plant.
A compression stress force produces reverse faults.<span> Compression stress squeezes the rocks together. This occurs at convergent plate boundaries as the plates move towards each other.</span><span />
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The answer is meiotic prophase I</span>. Chromosomal crossover occurs during prophase I of meiosis and refers to the exchange of materials from homologues chromosomes pairing up.