At a distance of a kilometer, Wen Ya and the black crow did not make much effort, and soon approached the gardener's alien botanical garden.

Less than five meters in front, behind those banana trees, were mutated black man-eating flowers that looked unremarkable.

The slender leaves that drooped shook slightly, Wen Ya took a deep breath and was about to jump into the alien botanical garden, the black crow suddenly made a move with a strange look, and the vines in his hand wrapped Wen Ya's wrist for the first time.

"Red Sand, something is wrong." The vines that the crow wrapped around Wen Ya's wrist did not retreat.

"What's wrong?" Wen Ya did not study plants, and immediately stopped her actions when she was entangled in her wrist by the black crow.

The black crow frowned, "The air around the Heterobotical Garden is very strange, the closer you get to the Heterobotical Garden, the higher the concentration of carbon dioxide in the air, it is normal to be thousands of meters away, the carbon dioxide concentration in the air at 500 meters has reached five percent, and now the carbon dioxide in the air has reached ten percent." ”

"What ......" On the way to get close to the alien plant, Wen Ya didn't see a single mutant insect, and there were no insect chirpings and bird calls in her ears, it turned out that a high concentration of carbon dioxide was doing tricks.

Carbon dioxide is a colorless and odorless gas, and it is not harmful to the human body when the content is small, but when it exceeds a certain amount, it will affect the breathing of people and animals, because after inhaling carbon dioxide, the concentration of carbon dioxide in the blood increases, the acidity increases, and acidosis is produced.

When the volume fraction of carbon dioxide in the air is 1%, you will feel stuffy, dizzy, and palpitations; When it reaches 4%-5%, it will cause dizziness, and when it reaches more than 6%, it will cause confusion, gradual cessation of breathing, and death.

"You've been doing plant photosynthesis just now? Now that the concentration of carbon dioxide in the air is so high, can you handle it? Wen Ya asked with some curiosity.

"No problem, an average adult emits about 3KG of pure carbon dioxide a day, and a hectare of forest can process one ton of carbon dioxide a day at its peak, and 10 square meters of forest or 25 square meters of grassland can process a person's daily carbon dioxide."

"After the alienation, I can process more than one ton of carbon dioxide a day, which is more than enough oxygen for you." The black crow nodded, and began to carefully observe the banana trees around her.

Cattle!

Wen Ya followed behind the black crow, bringing the black crow is equivalent to bringing a walking super oxygen tank, the concentration of carbon dioxide in the air is so high, no wonder the gardener doesn't even have a guard here.

The black crow observed the banana trees, observing them very carefully, and Wen Ya waited patiently on the sidelines.

"Red sand, I know, these planted banana trees are not ordinary alien plants, this plant is called guard banana, a single one will not cause any impact, two or more guard bananas planted in the effective range, will produce a relative carbon dioxide field, in the effective range and around the step-like, gather a large amount of carbon dioxide, close to the animal will definitely die."

"So, the closer you get to the center of the botanical garden, the higher the carbon dioxide content, so how do you break these guard bananas?" Wen Ya asked.

"It's okay to bypass it, although the guard banana can create a relative carbon dioxide field, it is not offensive in itself." The crow replied.

"Bypass?" Wen Ya glanced at the mutated black man-eating flower under the protection of the guard banana, the main purpose of coming today was to destroy these evil alien plants.

。 m.