<span>Stimulation of thoracic or lumbar spinal regions; impulse reaches chain ganglion; acetylcholine release</span>. Acetylcholine is released if the synapse happens in the sympathetic ganglion, if the synapse is in post-ganglionic neuron, norepinephrine is released.
The correct answer is "limited prey is driving the bears to seek food in human settlements".
Due to the warming of the Arctic waters, the ice is melting, resulting in a serious decline of floating winter ice. Polar bears need these floating parts of ice to hunt, therefore this new situation limits the hunting opportunities of the bears. That is why polar bears are driven to human settlements to look for food.
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Explanation:
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Answer:
1. ecology: e)the study of the relationship among organisms and the relationship between organisms and their environment.
2. Aristotle: g)an ecologist who developed classification system fro plants and animals.
3. environment: i) physical and biological surroundings of an organism.
4. cell: j) the basic unit of life.
5. Schleiden and Schwann: l) proved that cells are formed from the division of cells that already exist.
6.
7: ecosystem: i) physical and biological surrounding of an organism.
8: organism: k) any unicellular or multicellular organism.
9: biomes: c) land proportions of the ecosystem. e.g desert and tundra.
10: species: f) group or population of organisms that interbreed.
11: biosphere: h) the variety of species in different habitats on earth.
12: population: d) group of the same species living together in a certain location or region.
13: mutation:
14: Charles Darwin: b) proposed theory of natural selection.
15: species diversity: a) adaptability through random changes in the DNA.
The excretory system allows animals to remove metabolic waste their bodies. Many of these substances are potentially toxic. in Mammals nitrogenous toxins like urea are expelled through liquid urine while in reptiles and birds the nitrogenous compounds are expelled as a solid. This allows birds and reptiles to use less water in the processes of metabolism.
