Many insects have a tough outer shell called an exoskeleton..
Answer:
Fossils are the remains of ancient plants and animals that were buried millions of years back. These are found to be embedded in the sedimentary types of rocks. The earliest known direct fossils are not obtained in the present day, but the imprints of these fossils are explored in many of the places. These were the ancient micro-fossils such as bacterias, cyanobacteria that existed about 3.5 billion years back.
Some of the direct evidence of fossils are obtained from the rocks in the western part of Australia and the southwestern part of Greenland.
Thus, the imprints of these fossils are found in many rocks at different places, and this suggests the existence of life during that particular time frame.
D: An object that is accelerating is always changing speed.
Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top. How is ice less dense than water? ... So for water, the density actually decreases along with a decrease in temperature - causing ice to be less dense than water!
Answer:
Secondary succession
Explanation:
When a previously occupied area is re-colonized after a natural disaster or human activities that wiped out the previous community, then the type of succession is called a secondary succession. A practical example is abandoned farmland that a farmer left for a period of time and later revisited for farming afterwards.
Because the pioneer organism( sun-loving plants ) were already on ground it will be fast for them to populate the area,grasses will sprout up too. insects, dentritivores, reptiles will move into the habitats.
After 5years;The habitat is populated by shrubs, which owns the forest floors. small pine, oak may soon join.a stable climax community.
Assuming the community is not interfere with bigger dominant trees , e,g the oak developed and other tree developed to bigger tree , followed by more insects, birds, rodents, herbivores and some carnivores, This entire sequence of event may take 50 years, to reach this climax community.
