Cây cần những điều kiện gì để tồn tại và phát triển

Thực vật, giống như tất cả các sinh vật sống, có những nhu cầu cơ bản: nguồn dinh dưỡng (thức ăn), nước, không gian để sống, không khí và nhiệt độ tối ưu để phát triển và sinh sản. Đối với hầu hết các loài thực vật, những nhu cầu này được tóm tắt là ánh sáng, không khí, nước và chất dinh dưỡng (được gọi là LAWN viết tắt).

Explanation:

the cytokine-activated janus kinase (jak)-signal transducer and activator of transcription (stat) pathway has an important role in the control of immune responses. dysregulation of jak-stat signaling is associated with various immune disorders.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.