The answer would have to be A!!!!
Answer:
<u>Stigma </u>
Explanation:
<u> The head of the pistil. The stigma receives pollen, which will begin the process of fertilization.</u>
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a) Warm air rises and cool air sinks : Convection
b) Sun rays warming a puddle : Radiation
c) An egg on a hot skillet : Conduction
d) Boiling water in a pan : Convection
e) Lava lamp : Conduction, Convection, Radiation
f) Feeling the suns heat on your neck : Radiation
g) Stepping on hot sand : Conduction
<h3>
Explanation:</h3>
Convection: The mode of heat transfer involving fluids: liquids and gases due to convection currents produced in the fluids are termed as heat transfer due to convection. The <u>dense cool air sinks,</u> air currents push the warm air upwards and thus rising warm air is an example of convection. Boiling water is similarly warm water rising and cool water sinking; the provided heat produces <u>convection currents</u>. Boiling water in a pan is an example of convection.
Conduction: Heat transfer by direct contact between substances is called conduction. An egg on a hot skillet is fried by conduction. The hot frying pan transfers the heat to the egg. The metal frying pan and egg are <u>in contact </u>with each other. Stepping on hot sand makes us feel warm since the hot sand and our feet are <u>in contact</u>. Heat gets transferred through conduction.
Radiation: A puddle getting warm due to sun rays and feeling the sun's heat on our neck is clearly heat transfer due to radiation. Sun rays are <u>electromagnetic waves</u> that are capable of transferring heat energy. The materials are in no direct contact with each other in case of radiation.
A <u>lava lamp</u> shows all three heat transfer modes in different ways. The incandescent light bulb emits light and warms the metal at the bottom of the glass tube through <u>radiation</u>. The heat transfer between the metal below the tube and the liquid inside is through <u>conduction</u>. The flow of liquids with different densities (upward and downward) inside the glass tube is due to <u>convection</u> currents generated in the liquid mixture.
Decomposers, as the name suggests, decompose dead plants or animals into simple compounds. They feed on dead producers from the first levels or consumers from other three levels. Breaking them down, decomposers release nutrients that producers can use.
In an ecosystem with four levels, the first level are producers, such as plants and algae. On the second trophic level, there are primary consumers, herbivores that eat plants, for example, a deer, a rabbit, a grasshopper. The next trophic level belongs to secondary consumers that eat herbivores, for example, a wolf, a fox. The highest level is tertiary consumers that eat carnivores, for example, a bear, an eagle.
The scientist can insert the gene to a bacteria to form a transgenic bacterium. it can be kept in the incubator to produce the protein