bcause animals need oxygen 2 breathe & plants give off oxygen in exchange 4 CO2. & animals breathe out CO2.
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Plants are at the base of the food chain, providing food for herbivores, who are then preyed upon by carnivores. If plants were to die out, herbivores would lack a food source, leading to their extinction, which would in turn impact carnivores. The interconnectedness of ecosystems means that the loss of plants would have cascading effects on all levels of the food chain, eventually leading to the decline of most animal species.
Animals such as the dodo bird, passenger pigeon, and woolly mammoth were once edible but are now extinct due to various reasons including overhunting, habitat destruction, and climate change. These animals were hunted for their meat and hides, contributing to their eventual extinction.
Some recently extinct plants include the Chile sandalwood (Santalum fernandezianum), the Saint Helena olive tree (Nesiota elliptica), and the Western black rhinoceros (Diceros bicornis longipes). These plants have faced extinction due to factors such as habitat loss, invasive species, and climate change.
It's possible that scavengers like foxes and raccoons would have benefited from a continued presence of passenger pigeons due to the abundance of food. Similarly, certain bird species that may have relied on the pigeons as a food source or for nesting sites could have also experienced changes in their populations due to the extinction of passenger pigeons.
Scientists believe that the increased density of material deeper into the mantle is primarily due to the increase in pressure as you go deeper into the Earth's interior. The weight of the overlying rock layers compresses the material below, causing it to become more tightly packed and denser. Additionally, changes in mineral composition and temperature can also contribute to the increased density.
As more and more animals become extinct and on the endangered species list zoology will, in fact, become a top profession. We will need to know where the animals come from and how they breed in order to keep them alive. Our animal life is essential to our survival. So, yes, zoology will be very much needed especially in 5 years.