What would happen if the temperature of the Tundra increased?

The permafrost will melt and since the tundra is flat land bogs and shallow lakes will appear and won't drain. Rainfall will change, although I'm not sure if it will increase or decrease. Plants will also change, some will die, but others will thrive in the warm weather. Warm-blooded animals would die in mass. The animals would die because the temperature interrupts chemical reactions within the organisms' cells.

Does it sound alright? Are there any grammar/spelling mistakes?

Comma after "melt"

Comma after "flat"

Run-on after the second sentence.

It's "en masse" not "in mass."

"the organisms' cells" = what organisms' cells??

okay which is the run on sentence? The rainfall or plants?

The explanation seems mostly accurate, with a few minor improvements in grammar and clarity. Here's a revised version:

If the temperature of the Tundra increases, several changes are expected to occur. One significant impact would be the melting of permafrost, which is the permanently frozen layer of soil and rock beneath the surface. As a result, flat land bogs and shallow lakes may form and will not drain properly. The exact effect on rainfall is uncertain, as it could either increase or decrease depending on various factors.

The changing temperature would also have major implications for plant and animal life. While some plants may struggle to survive and potentially die out, others may thrive in the warmer conditions. However, warm-blooded animals would likely face detrimental consequences. The elevated temperature would disrupt the normal chemical reactions within their cells, leading to mass die-offs.

Overall, your explanation captures the key points, but remember to proofread for grammar and spelling errors before finalizing your response.