Biology

Ovulation is the cyclical process, in which a female produces ova (eggs) in an ovary (ovarian gland/follicle), and discharges them toward the uterus via a fallopian tube in preparation for conception (about mid-cycle). This process is the underlying function of the menstrual cycle, not the bleeding which actually ends the cycle.

The endocrine system affects cells with certain receptors .

The nervous system can affect only nearby cells

Gene flow is genes moving between two populations.

the transfer of genes from one gene pool to another

two populations transferring genes

A system that groups organisms by ancestry

amphibians

Speciation Adaptive radiation refers to changes in a species in response to varying environmental conditions.

many new species form

The distribution of alleles changes due to random chance.

or

The allele frequency of a population changes due to a bottleneck effect. <apex>

population bottleneck

Apex is Mergus serrator and Mergus merganser.