生物的亲子间和子代个体间的相似性叫做____;亲子间或子代个体间的差异叫做____.这两种现象是生物界普遍存在的现象,它们是通过____和____而实现的.
wǎn gōng dā jiàn
____
yán lì chéng fá
shāo shú shí wù
①BC段较AB段CO2浓度增加减慢,是因为低温使植物呼吸作用减弱
②CO2浓度下降从DE段开始,说明植物开始进行光合作用
③FG段CO2浓度下降不明显,是因为气孔关闭,叶片对CO2的吸收减少
④H点CO2浓度最低,说明此时植物对CO2的吸收最多,光合作用最强.
与20相邻的两个数是____ 和____。
My name is Lucy. I have two good friends, Mary and June. June and I are twelve years old. Mary is thirteen years old. My birthday is November 11th.June's birthday is September 11th .And Mary's birthday is January 18th. I like red, but they like green. Mary and June are in the same school. They have an Art Festival and a school trip every year, but I only have a Music Festival at my school.
北京2008年奥运会的奥运火种取自于西方文明的发源地,西方文明的发源地是指( )