What happens when a specific substance binds to a carrier protein? The carrier protein changes shape and moves the substance through the cell membrane. The cell receives a signal to send a vesicle that shuttles the substance across the cell membrane. The substance breaks down into smaller particles, making it easier for the protein to transport the substance into the cell. The carrier protein secretes acid that helps dissolve the substance so that it can diffuse through the cell membrane.

maritime tropical may be your answer.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.

thats not a question