<h2>Answer:</h2>
- Ionic bond: It is the bond formed by the complete transfer of electron from one atom to an other atom.
- Covalent bond: It is the bond formed by the mutual sharing of the electrons.
- Van der waal: These are weak interactions between one molecules with other polar or non polar molecules to hold to each other by weak force of attraction.
<h2>Explanation:</h2>
- <u>Similarities between van der waal, ionic bonds and covalent bonds:</u> All of them are a type of inter-molecular forces, in which ionic bonds are stronger than covalent bond and van der walls forces. And covalent bonds are stronger than van der wall forces.
- <u>Difference between van der waal and ionic bonds:</u> Ionic bonds are formed by complete transfer of electrons from one atom to an other atom. Covalent bond are formed by sharing of electrons while in van der waal, there is a slight attraction when oppositely charged molecules come close to each others.
Result: Van der wall forces are weakest among ionic and covalent bonds.
Answer:
[The recent activities of fossil fuel combustion has had adverse effects on the ozone layer]- B.
Competition help to regulate population growth since only those who are able to obtain food survive.
Crop plants and weeds may compete for water and for sunlight.
Farmers spray herbicides early in the growing season to avoid competition between crop plants and weeds.
<h3>What is the effect of competition on population?</h3>
Competition among species help to regulate population growth by ensuring that only those who are able to obtain food survive. Thus, only fit individuals of a species survive.
Crop plants and weeds may compete for water because water enables them to carry out metabolic activities of growth and development.
Crop plants and weeds may also compete for sunlight and they need sunlight to carry out photosynthesis.
Farmers spray herbicides early in the growing season in order to avoid or reduce competition between crop plants and weeds.
In conclusion, competition among species helps to control overpopulation.
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High-quality cpr is administered when you compress the chest to which depth about 2 inches.
<h3>
CPR</h3>
Cardiopulmonary resuscitation (CPR) is a life-saving emergency technique that involves giving someone who is having a cardiac arrest chest compressions and sometimes artificial ventilation in an effort to keep their brain functioning normally until additional steps are taken to bring back their breathing and spontaneous blood circulation. In people who are unresponsive and not breathing or who are breathing abnormally, such as experiencing agonal respirations, it is advised.
Adults who need CPR must perform chest compressions between the depths of 5 cm (2.0 in) and 6 cm (2.4 in) per minute, at a minimum.
By utilizing a machine that forces air into the subject's lungs or by exhaling into the subject's mouth or nose (mouth-to-mouth resuscitation), the rescuer can also offer artificial ventilation (mechanical ventilation).
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