A medial moraine is a narrow band of rock debris which usually runs down the centre of the glacier. It forms from the merging of the lateral moraines of two glaciers and often occurs in regions that have been acted upon by a past ice age.
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The shallow shoulder socket makes the joint unstable, which makes the bone easy to dislocate.
Answer:
10 % of the energy (i.e., 50 calories) is converted to biomass
. This efficiency of energy transformation is high
They have evolved into the best length for their environment.