When you are approaching a river lock, you are expected to sound one prolonged blast and one short one in order to signal to the lock attendant that you want to pass through. You are to sound the blast when you are about one mile away from the river lock. The attendant will reply you with one of the traffic signals in order to instruct you about what to do.
Answer:
In an acidic or neutral solution, red litmus paper remains red. In an alkaline solution, red litmus paper turns blue. When an alkaline compound dissolves in water, it produces hydroxide ions, which cause the solution to become alkaline.
Explanation:
Answer:
Biotechnology greatly improved biodiversity. For example, Genetic modification produces genetically modified animals, plants and organisms. If they are introduced into the environment they can affect biodiversity. For example, existing species can be overrun by more dominant new species. Assessing the impact on biodiversity requires knowledge.