Answer: The earthworm contracts and extends in its movement, but the nematode moves side by side.
Explanation:
NOTE: By mode of location, we mean the way it moves.
The skin of a nematode is very unusual in that it secretes a thick outer cuticle which is both hard and flexible. And this cuticle makes it sustain a side by side mode of location. The closest thing a roundworm has to a skeleton is its cuticle and it uses it as a support and balance point for movement. Long muscles lie just underneath the epidermis and are all aligned longitudinally along the inside of the body, so the nematode can only bend its body from side to side, not contract or extend itself.
Whereas the earthworm extends and contracts as its mode of location.
An earthworm moves by using its two different sets of muscles: circular muscles for looping around each segment, and the longitudinal muscles for running along the length of the body.
The contraction of the circular muscles make the earthworm stretch becoming longer and thinner. The earthworm uses its longitudinal muscles to contract and thus becomes shorter and wider or it bends from one side to the other, pulling the body forward in the process. The earthworm withdraws the front setae and uses its rear setae to anchor itself at the back. Then the earthworm uses its circular muscles to lengthen and push itself forward again.
In a recent article, we call this anthropogenic drought, which is water stress caused or intensified by human activities, including increased demand, outdated water management, climate change from anthropogenic greenhouse gas emissions, growing energy and food production, intensive irrigation, diminished supplies
Answer:
<u>Greenland Norse collapse</u>
Explanation:
- The southern Greenland Vikings numbering 5000 at their peak never gave up their old way of lifestyle and did not adopt that of the Northern Inuits who arrived a century later after them.
- The study suspects that the climate factors became dominant and they were destroyed by the shifting nature of mother earth hence they starved to death and could not adapt to the present change in weather patterns this society collapsed.
- Some theories say soil grazing and over-exploitation of land lead to the effect of black deaths and the creation of ice age. It indicated that the number of fertile women dropped and thus population could not sustain itself.
Answer:
City A is located in the Southern Hemisphere.
Explanation:
On this diagram, we can see that City A has the most daylight hours during the month of December, while the least daylight hours it has in the month of June. This means that the summer is present during December, January, and February, while winter is present during June, July, and August. This may seem strange to the majority of the people on the planet, as it is reversed from what the majority of the global population is experiencing, but the explanation is very simple.
This city is located in the Southern Hemisphere, not the Northern Hemisphere. The season in the two hemispheres doesn't occur in the same periods, but in opposing periods, so when it is summer in the Northern Hemisphere it is winter in the Southern Hemisphere, and when it's winter in the Northern Hemisphere it is summer in the Southern Hemisphere. The reason why this happens is the inclination of Earth, which results in one half of the year the Northern Hemisphere to be facing the Sun and thus get more sunlight, while in the other half of the year the Southern Hemisphere faces the Sun and gets more sunlight.
