The answer is An endangered species is a type of organism that is threatened with extinction. Species are becoming endangered for two main reasons: habitat loss and loss of genetic variation.
- Habitat loss can occur naturally. The dinosaurs, for example, lost their habitat about 65 million years ago. The hot, dry Cretaceous climate changed very quickly, most likely due to an asteroid impact on Earth. The asteroid's impact threw debris high into the atmosphere and reduced the amount of heat and light reaching Earth's surface. The dinosaurs could not adapt to this new, cooler habitat. The dinosaurs were threatened with extinction and then died out.
- Human activities can also contribute to habitat loss. The development of settlements, industry and agriculture reduces the habitat of native organisms. This can be done in a number of ways.
- Development may directly remove native habitats and species. In the Amazon rainforest in South America, developers have cleared hundreds of thousands of hectares. Clearing a piece of land means removing all trees and vegetation. The Amazon rainforest is being cleared for ranching, logging and urban use. That means the habitat can support fewer cougars. However, since large parts of the Sierra Nevada, Rocky and Cascade mountain ranges remain undeveloped, cougars are not in danger.
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Complete question:
You will find the image of the skulls in the attached files.
Answer:
1) 2 similarities between each of the skulls might be the presence of the nasal spine, and the interdental space.
2) The size of the skull seems to be the most noticeable change in skull anatomy between the dawn horse and the modern horse.
Explanation:
- Each of the nasal bones in horses ends in a protuberance named "the nasal spine". These spines converge in the distal portion of the bone. These spines and the incisive bone delimitates the space called the naso-incisor notch. In the attached figure you will see the nasal bone in red and the nasal spines. This structure is present in all the skulls in the same position.
- The interdental space is the space left between the front teeth and the back teeth. It is useful to recognize a male from a female in modern horses. This space can be found in all the skulls. You will see it in blue in the image.
The biggest change in skulls between the dawn horse and the modern horse is the size. The skull keeps the original shape or very similar shape but varies in length and height.
1. C) The soil will have no nutrients to grow the corn.
2. C) Crops may cause an increase of allergic reactions in humans
3. B) Decomposers