Which of the following events shows an effect of human-led climate change in a tropical climate zone?

ground in siberia that’s usually frozen year-round begins to thaw.

higher temperatures cause drier conditions in the amazon rainforest.

populations of native grasses in the midwestern united states are declining.

risk of flooding rises in the pacific northwestern portion of the united states.

The correct answer is: Higher temperature cause drier conditions in the Amazon rainforest.

Explanation:

Climate change is simply a recognizable change in the weather elements across the globe mostly as a result of increase in the global temperature, a phenomenon popularly known as global warming.

Global warming has been attributed to be as result of increase in the concentration of greenhouse gases in the atmosphere, especially whose concentration is mostly as a result of human activities. The greenhouse gases absorb heat from the sun and causes warming of the entire globe. The more their concentration in the atmosphere, the more the heat they absorb and the higher the temperature of the globe will get.

Tropical climate is a type of climate whose average annual temperature always exceeds 64 degree Fahrenheit with considerable amount of rainfall in some parts of the year.

From the the options, only Amazon rainforest falls within the tropical climate zone. The effects of human-led climate change include desertification, rise in ocean levels associated with melting of polar ice caps, change is species diversity among several other effects.

Hence, the correct option is: higher temperatures cause drier conditions in the Amazon forest.

Using the gas pedal analogy, the proto-oncogene would be an accelerator since they promote cell division and deregulate apoptosis, while tumor suppressor would be the brakes since they constrain the progress of the cell cycle and induce cell apoptosis. An oncogene is, therefore, when the accelerator is stuck in down position and the brakes are not working.