spermatozoa rush to victory. movement through the fallopian tubes

anatomy background best biology biotechnology cell cells competition disease fallopian fast fertile fertility fertilization genetic health human illustration inseminate insemination irresistible life lively macro medical medicine micro microbiology microscopic movement natural organic ovule person pregnancy procreation red rendering reproduction reproductive research rush science scientific selection semen sex sperm spermatozoa spermatozoon tubes victory winner zinger zoosperm