Questions

Which of the following virus overtake computer system, when it boots and destroy information  ? 

Which one of the following statements about Exchange-Traded Fund (ETF) is not correct?

Read the passage carefully and choose the best answer to each question out of the four alternatives.

Genetic variation is the cornerstone of evolution, without which there can be no natural selection, and so a low genetic diversity decreases the ability of a species to survive and reproduce, explains lead author Yoshan Moodley, Professor at the Department of Zoology, University of Venda in South Africa.

Two centuries ago, the black rhinoceros – which roamed much of sub Saharan Africa – had 64 different genetic lineages; but today only 20 of these lineages remain, says the paper. The species is now restricted to five countries, South Africa, Namibia, Kenya, Zimbabwe and Tanzania. Genetically unique populations that once existed in Nigeria, Cameroon, Chad, Eritrea, Ethiopia, Somalia, Mozambique, Malawi and Angola have disappeared. The origins of the 'genetic erosion' coincided with colonial rule in Africa and the popularity of big game hunting. From the second half of the 20th century, however, poaching for horns has dramatically depleted their population and genetic diversity, especially in Kenya and Tanzania.

From the second half of the 20th century what has caused a dramatic fall in black rhinoceros population?

Any body kept in a fluid experiences an upward force called _____________.

Improve the bracketed part of the sentence.

It also indicates the caveats and failure modes in the model need to be improved before (been used independently).

Echoes may be heard more than once due to successive or multiple

When water freezes its density

Website address is a unique name that identifies a specific ___ on the web.