What is the primary purpose of keeping doors and windows closed during the laboratory session?

Hye-seung is giving a speech on turtles, specifically on the need to protect the turtle population in the pacific ocean due to rising ocean temperatures. the general purpose of her speech is likely:

Match the following items. 1. free enterprise system 2. mixed economy 3. the former soviet union 4. land and capital (a) private and state ownership of business (b) factors of production (c) private ownership of capital (d) command economy

What does one prolonged blast and one short blast mean?