Explanation:
By all the carnivores, I assume it means regular and top carnivores. This will let the herbivores live longer which means they eat more food, food being producers causing producer numbers to fall drastically
Answer;
-Gemstones
Gemstones are nonmetallic minerals that are valued for their beauty and rarity rather than their usefulness.
Explanation;
-Most gemstones form in the Earth's crust; the top layer of the Earth, with a depth of 3 to 25 miles. Only two gemstone varieties, diamond and peridot, form in the Earth's mantle, which represents 80% of the Earth's volume.
-A few gemstones form in the mantle, but all gems are mined in the crust. A precious gemstone has beauty, durability, and rarity, whereas a semiprecious gemstone has only one or two of these qualities.
Hydropower involves blocking rivers, which disrupts ecosystems.
Explanation:
Prolonged use of hydropower can disrupt the ecosystem since it involves the blocking of rivers. This is a long term impact hydropower generation.
- Hydropower is a renewable source of energy in which water is used to generated electricity.
- The water is sourced from large river bodies with a lot of kinetic energy in them.
- Huge volumes of water discharge is needed for this process.
- Therefore, water must be dammed for this purpose.
- Damming of water bodies affects the ecosystem.
Learn more:
Non-renewable energy sources brainly.com/question/3386515
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Models are simplified representations of of different complex systems. They also help to study very small or large objects.
Option B, D and E.
Explanation:
Models are very simplified representations of complex systems and organs or structures which are prepared to study those systems by scientists and normal people easily. Many structures of human body like cells or some tissues are very small in structure or microscopic in nature. So studying them are very hard without specific instruments which are not always available. Thus models are made to easily study those structures by scientists and even normal people and students.
