These weeds are growing in a farmer's field. The weeds compete with the soybean plants the farmer grows, so he needs to get rid
of them. For a few years, the former relies on manually removing the woods, but that is labor intensive and limits how much crop he can grow. The farmer decided to change his crop to genetically modified soybeans that are herbicide resistant. This allows the farmer to use chemicals to remove the weeds. With this GM soybean, the chemical kills the woods but does not harm the crop. For many years this works, and allows the farmer to expand his farm and grow more soybeans. But then, one of the farmer's fields has a large weed plant remaining after the field has been sprayed with herbicide 1. Which of the following is the likely reason the weed has remained?
a. The weed needed to be resistant in order to survive, so it became resistant
b. A mutation appeared in one weed plant that made that weed not susceptible to the herbicide
2. Which of the following is likely to happen if that weed stays in place?
a. The trait will spread to nearby weeds
b. The weed will survive long enough to reproduce
c. In time, the herbicide will no longer be effective on that field.
Elephants have being able to survive in the savannah due to its ability to adapt. Elephants natural have no sweet glands so they have to device other means to cool their selfs, th ey achieve this by flapping their ears to create the cooling effects they need to survive in their environment. They also posses tusk and long trunks which they used for eating and drinking. The adaptation of the elephants to the African savannah has being due to the effects of environment and the genes. A popular example is an African elephant is different from it’s counterpart from Asia. Africa elephants have bigger ears unlike Asians which are smaller
