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Did you know?
More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
Did you know?
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
Did you know?
The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
![The sexual cycle of flowering plants involves alternation of sporophyte and gametophyte generations.](https://biology-forums.com/gallery/47/medium_33_24_07_11_10_29_04.jpeg)
![Water striders serve as a model organism for the study of sexual conflict between males and females.](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_15_38_17251747.jpeg)
![Sexual swellings are one way for females to advertise their mating availability, thereby inducing ma](https://biology-forums.com/gallery/47/medium_269691_26_01_15_5_55_23_204361867.jpeg)