Unite1牛子成语Structures of the Lung and the Kidney (肺和肾的结构)The Blood Vesls of the Lung (肺的血管结构)燃气灶炉头The lung receives its blood supply from two vascular systems—the bronchial and pulmonary circul
Journal of Experimental Botany, Vol. 65, No. 4, pp. 1193–1203, 2014doi:10.1093/jxb/ert482 Advance Access publication 24 January, 2014This paper is available online free of all access charges (e http
边际价值理论(Marginalvaluetheorem)——吃货与打怪边际价值理论(marginal value theorem)是动物⾏为研究中最适理论(optimal model)的⼀种应⽤,这个理论最早由美国进化⽣态学家Eric Charnov在1976年提出。该理论描述的是:有这样⼀种环境,环境中的⾷物资源离散分布,形成离散的⾷物斑块,动物在斑块中取⾷消耗⾷物资源并在不同的斑块中移动;此时