Answer:
1. Molecular evidence: similar proteins and genes found in closely related species, even if those genes are not used by an organism.
2. Fossil evidence: organisms changing form over time through the fossil record.
Direct observation. We can directly observe small-scale evolution in organisms
with short lifecycles (e.g., pesticide-resistant insects).
Explanation:
When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells. A two-kingdom system was no longer useful. Today the system of classification includes six kingdoms.
The palisade cells are the main site of photosynthesis, as they have many more chloroplasts than spongy mesophyll, and also have several adaptations to maximizes photosynthesis efficiency. Large Vacuole restricts chloroplasts to a later near outside of the cell where they can be reached by light more easily.
Answer:
The pollution present in the air is primarily categorized as chemical, physical and biological sources, apart from this it is also categorized as natural and anthropogenic sources of pollution. The anthropogenic sources of pollution are caused mainly due to human activities, that is, these are the man-made sources of pollution.
The anthropogenic pollution arises due to deforestation, burning of fossil fuels, discharges originating from the industries, fertilizers, and pesticides, etc. The prime anthropogenic pollutants present in the air originate due to the combustion of fossil fuels. In the United States, the three prime anthropogenic sources of gaseous air pollutants are transportation, industry, and production of energy.
Scientists continuously find fossilized bodies of dinosaur bones that all appear to have died the same way. It is because of these discoveries that we know that dinosaurs and other pre-historic species existed on Earth 66 million years ago.
