The hierarchical order of organization of multicellular organisms is shown below. cells → tissues → organs →

What level of organization is next in the hierarchy?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.

How do the sperm cells get from the stigma to the ovules?

According to these anatomical structures which two animals are probably most closely related