JSS 1 Basic Science

Disease vectors  are organisms that transmit pathogens and Parasites from an infected person to another. Examples of vectors are : mosquitoes, Housefly , cockroach etc.

         Types  of  Vectors are :Ticks , mosquitoes, ticks bugs etc .

The earth exerts a pull on bodies towards the centre of the earth . This pull or force is gravitational.The earth's gravitational force, GF is the product of the mass ,m, of a body and the acceleration of the gravitational force ,g, ie. GF=mg.

Have you compared walking on an oily tarred road  on a wet day with that of a dry tarred road? It is easier to walk   on  the latter. The reason is that friction is experienced more on the dry tarred road much more than on the  oily slippery road . The greatest advantage  is  that  by opposing motion , it aids walking  , running or movement generally.

 Sleeping Sickness is a disease of human beings, horses and cattle. The tsetse fly is the vector of the parasite (Trypanosoma) that causes sleeping Sickness in man and nagana in cattle and horses.

The word renewable means restorable or replaceable.In life , generally  some things can  be renewed or  restored while some cannot. In the same way, some types of energy are renewable while others are non -renewable.