At Glacier Bay, Alaska, why were Dryas (an herbaceous plant) and alder trees among the first plants to appear during the ecological succession of gravel deposits left behind by a retreating glacier?
a) Dryas and alder trees are the most abundant plants that grow in that area.
b) The seeds of Dryas and alder trees are easily transported to gravel deposits.
c) Dryas and alder trees have nitrogen-fixing bacteria in nodules on their roots.
d) Dryas and alder trees grow well on rocky soil.
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