What are the meaning of these words

1)  Black Flies are small black flies, the female of which sucks blood and can transmit a number of serious human and animal diseases. Large swarms sometimes cause distress to livestock and humans.

2)  Malaria is an intermittent and remittent fever caused by a protozoan parasite that invades the red blood cells. The parasite is transmitted by mosquitoes in many tropical and subtropical regions.

3)  Carnations are a doubled-flowered cultivated variety of clove pink, with gray-green leaves and showy pink, white, or red flowers.

4)  Cattle are large ruminant animals with horns and cloven hoofs, domesticated for meat or milk, or as beasts of burden; cows.

5)  Crabgrass is creeping grass that can become a serious weed.

competition i thin