The correct option is A.
Succession refers to the process by which the structure of a particular biological community evolves over a period of time. There are primary and secondary succession. Primary succession usually occur in an area in which the soil is not capable of sustaining the growth of plants. The options B, C and D given in the questions are examples of primary succession.
Answer:
An electron is a negatively charged particle, whereas a proton is a positively charged particle. The magnitude of their charges is equal. Therefore, an atom containing one electron and one proton will not carry any charge. Thus, it will be a neutral atom.
Answer:
Viruses are not made up of cells. They are made up of a set of genes within a caspid, a protective shell
Explanation:
Gregory wants to make a hole in a flat piece of wood. He places object Y on the piece of wood, and then object X on top of it.(C) a screw and a wedge
Explanation:
Screw is used to drill a hole in the wood and the wedge is used to insert it properly.
The screw moves in a circular motion and thus creates a hole in the wood whereas a wedge is used to apply appropriate force on the screw .so that it can be placed properly in the wood.
The a screw and a wedge are termed as simple machines.Simple machines are those machines that we make use of to do day to day task at home.
So we can say that Gregory wants to make a hole in a flat piece of wood. He places object Y on the piece of wood, and then object X on top of it.(C) a screw and a wedge
