Answer:
Topographically SN is classified into:
1. Central SN- made up of the brain and spinal cord
2. Peripheral SN- made up of nerves (31 pairs of spinal nerves, 12 pairs of cranial nerves), nerve plexuses and nerve ganglia
Structural Dpdv
1. Somatic SN \ of relationship life
2. Vegetative SN a) sympathetic- acts in unusual conditions (eg stress, fear)
b) parasympathetic- acts in normal life conditions
Explanation:
Answer:
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.
Various Human Activities That Affect an Ecosystem
Agriculture.
Deforestation.
Overpopulation & Overconsumption.
Plastic Production.
Emission of Carbon Dioxide and Other Greenhouse Gases.
Destruction of the Reefs.
Production of Black Carbon.
Draining Streams/Rivers and Destruction of Critical Freshwater Aquifer Recharge Areas (Water Pollution)
Explanation:
Hope this helps!
Answer:
d) do all jobs for survival
Explanation:
A single cell perform all its activity on its own.
Answer: As a fertilized human egg divides, it first becomes a solid ball of cells, the morula. ... The cells of the outer layer of the blastocyst eventually form part of the placenta. Inside the ball is a small clump of cells, the inner cell mass, that will form all the tissues in the body.
Explanation:
