Answer: B) Electron transport chain Explanation:

Answer: A) Heart Explanation: Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well).

Answer: C) 21 Explanation: A prime number is a whole number greater than 1 whose only factors are 1 and itself.   Factors of 5 are 1, 5 Factors of 11 are 1, 11 Factors of 21 are 1, 3, 7, 21 Factors of 37 are 1, 37.   Hence, according to the definition of a prime number, 21 is not a prime number as it has more than two factors.

The Holocaust, also referred to as the Shoah,[b] was a genocide during World War II in which Nazi Germany, aided by its collaborators, systematically murdered approximately 6 million European Jews, around two-thirds of the Jewish population of Europe, between 1941 and 1945. The Holocaust originated in Nazi Germany in the late 1930s and eventually spread throughout Central and Eastern Europe into countries invaded and occupied by Germany during World War II. The Nazis were racists and believed their race was more important. Nazis believed that the jews were a problem. Many of the non-germans that were living on the land were sent to concentration camps. The main place it took place was eastern Germany and Poland. The Holocaust was largely comprised of a vast network of concentration camps in countries including Germany, Poland, Austria, Ukraine, Norway, the Czech Republic, Slovakia, Belarus, the Netherlands, and France.

Answer: B) Africa Explanation: We know that, there are 7 continents in the world. They are : Asia, Africa, Australia, North America, South America, Europe and Antarctica.   Africa - 53 countries Asia - 48 countries Europe - 45 countries Antarctica - 0 countries   Hence, the continent Africa has most number of countries with 53 countries and in second place Asia has 48 , third Europe has 45 countries.

Answer: A) Kazakhstan Explanation: Kazakhstan is the largest landlocked country in the world with an area of 2,724,900 km² and the ninth largest in the world. Kazakhstan is located in Central Asia bordering 5 countries, China, Kyrgyzstan, Russia, Turkmenistan, and Uzbekistan.

Answer: A) Fimbriae Explanation: The fimbriae of the uterine tube, also known as fimbriae tubae, are small, fingerlike projections at the end of the fallopian tubes, through which eggs move from the ovaries to the uterus. The fimbriae are connected to the ovary.

A Coffin.