Answer:
We live in an era of unprecedented road and highway expansion — an era in which many of the world’s last tropical wildernesses, from the Amazon to Borneo to the Congo Basin, have been penetrated by roads. This surge in road building is being driven not only by national plans for infrastructure expansion, but by industrial timber, oil, gas, and mineral projects in the tropics.
Few areas are unaffected. Brazil is currently building 7,500 kilometers of new paved highways that crisscross the Amazon basin. Three major new highways are cutting across the towering Andes mountains, providing a direct link for timber and agricultural exports from the Amazon to resource-hungry Pacific Rim nations, such as China. And in the Congo basin, a recent satellite study found a burgeoning network of more than 50,000 kilometers of new logging roads. These are but a small sample of the vast number of new tropical roads, which inevitably open up previously intact tropical forests to a host of extractive and economic activities.
Explanation:
Answer:
A cell is made up of several molecules working together; a tissue is made up of many cells, working together; and an organ is made up of several tissues working together.
Explanation:
Answer:
Option (a).
Explanation:
The botanist may be defined as the individual who does the complete study about the plants. The physical condition and environmental condition that affect the plants are studied by the botanist.
The botanist has expressed the potato plant in two different condition as explained in the question. AVR protein can cause the death of the plants. The mortality or death rate will be higher in those plants that are exposed to the oomycete species as this species will produce the large amount of protein that causes the mortality in plants.
Thus, the correct answer is option (a).
Answer: C
Explanation: Smaller single-celled organisms have a high surface area to volume ratio, which allows them to rely on oxygen and material diffusing into the cell (and wastes diffusing out) in order to survive. The higher the surface area to volume ratio they have, the more effective this process can be.