Open circulatory system is found in ________

Explanation

The question is asking about which animal has an open circulatory system. An open circulatory system is a type of circulatory system where the blood does not flow in a closed circuit of blood vessels, but instead flows freely within the body cavity. The options given are Lizard, Toad, Fish, Insect, and Chicken. Out of all these options, the correct answer is Insect. Insects have an open circulatory system where the blood, called hemolymph, flows freely in the body cavity. This hemolymph is pumped by the heart into the body cavity where it bathes the organs and tissues. The hemolymph then returns to the heart to be pumped again. Other animals, including Toads, Fish, Lizards, and Chickens, have closed circulatory systems where the blood flows within blood vessels. In these animals, the blood is pumped by the heart through arteries, capillaries, and veins, which allows the blood to reach all parts of the body. Understanding the different types of circulatory systems is important in Biology. Closed circulatory systems are generally more efficient at delivering oxygen and nutrients to the body's cells, while open circulatory systems are simpler and less energy-intensive. To learn more about this, please read the relevant sections of the recommended textbooks.