Speciation can be difficult to observe in nature, but the it is hypothesized that the following occurs in a allopatric speciation's intermediate stage:
(1) closely related species are differentiated through geographic variation (2) then there's reduced fertility in one a geographic race of the species (3) and in the geographic race of subspecies that are to become species.
Answer: a. True
Explanation:
This is an important definition in health and safety courses.
Answer
Lower Mantle-under high pressure and nearly solid.
Lithosphere-contains the crust
Core-creates the Earth’s magnetic field
Asthenosphere-most deformable layer.
Explanation
The mantle is located below the crust and it occupies the largest volume of the Earth’s volume. The mantle behaves like a plastic and at high pressures and temperatures the rocks in the mantle deform
The lithosphere is the outer shell that contains the crust and upper mantle. The lithosphere is divided into the oceanic layer and the continental layer. It is bounded by the atmosphere and the Asthenosphere.
Answer:
Biotic Factors: Low Shrubs (sedges, reindeer mosses, liverworts, and grasses), Crustose and Foliose Lichen, Herbivores (lemmings, voles, caribou), Carnivores (arctic foxes, wolves, polar bears), Migratory Birds (ravens, snow buntings, falcons, loons), Insects (mosquitoes, flies, moths, grasshoppers), Fish
Explanation:
Answer:
C
Explanation:
When it precipitates, the acid in the soil becomes dissolved forming an acidic solution. The low pH solution dissolves the calcium ions in the soil washing them away in runoffs and also leaching them deeper into the soil. This depletes the calcium ions hence making them unavailable to the birds. Calcium intake is important in birds because the ion is a significant component of eggs shells (makes them strong and not brittle hence the eggs don’t break easily)..
