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Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Did you know?
Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
Excessive alcohol use costs the country approximately $235 billion every year.
Did you know?
The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
![Risks of infectious disease increase in (a) high-density agricultural populations compared to (b) lo](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_45_13_208671102.jpeg)
![Over the past four decades, the self-reported health of married men and women has remained high, ...](https://biology-forums.com/gallery/47/medium_660365_23_12_16_3_52_08_243681070.jpeg)