<u>Answer:</u>
In ecology, catastrophes permanently alter the physical structure of the existing environment.
<u>Explanation:</u>
- The ecological disturbances include flood, strom, plague, fires, earthquakes, tsunami, volcanic eruptions, climatic change and impact of humans on the environment like deforestation ,nuclear testing etc.
- These factors can have a visible impact on the structure of the earth and permanently alter the environment.
- The visible effects of these disturbances are global warming, extinction of selective species, change in the course of rivers, submergence of coastal areas, sudden movement of the tectonic plates and formation of sudden cracks on the earth's crust.
Answer:
level 2 = 3,000 level 3=300
Explanation:
Only 10 percent will be transferred to the next level and 10 percent of 30,000 is 3,000. 10 percent of 3000 is 300
Lysosomes are much like a garbage can because they use a degenerative enzyme to dissolve materials the cell doesn't need.
Complete question:
An important challenge to traditional (pre-1860) ideas about species was the observation that seemingly dissimilar organisms, such as hummingbirds, humans, and whales, have similar skeletal structures. This most directly suggested to biologists that __________.
a) only the best-adapted organisms can survive
b) advantageous changes can be passed along to offspring
c) most evolution occurs rapidly following a mass extinction
d) dissimilar organisms might have evolved from a distant, common ancestor
e) all of the above
Answer:
d) dissimilar organisms might have evolved from a distant, common ancestor
Explanation:
Many dissimilar organisms, such as hummingbirds, humans, and whales share some structural similarities such as common basic skeletal structures present in their body parts. This led the scientist to conclude that organisms with several observable differences share common ancestors. This is why these dissimilar organisms have some similar homologous skeletal structures.
For example, the bones present in the forearms of humans and whales are the same irrespective of their different outer morphology. This suggests that humans and whales share common ancestors.
