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In humans, the uterus is located within the pelvic region immediately behind and almost overlying the bladder, and in front of the sigmoid colon. The human uterus is pear-shaped and about 7.6 cm (3.0 in) long, 4.5 cm (1.8 in) broad (side to side), and 3.0 cm (1.2 in) thick. [2] [3] A typical adult uterus weighs about 60 grams.
The uterus or womb is the major female reproductive organ. The uterus provides mechanical protection, nutritional support, and waste removal for the developing embryo (weeks 1 to 8) and fetus (from week 9 until the delivery). In addition, contractions in the muscular wall of the uterus are important in pushing out the fetus at the time of birth.
The bees of B. impatiens are similar to those of B. bimaculatus, B. perplexus, B. vagans, B. sandersoni, and B. separatus in their appearance. [4] [10] They have short and even hair, medium-sized heads with cheeks that are similar in width to their heads, and a long and rectangular body. [4]
Human reproduction usually involves internal fertilization by sexual intercourse. In this process, the male inserts his penis into the female's vagina and ejaculates semen, which contains sperm. A small proportion of the sperm pass through the cervix into the uterus and then into the fallopian tubes for fertilization of the ovum. Only one sperm ...
Bombus crotchii, commonly called Crotch's bumble bee, is a species of bumblebee named after the entomologist George Robert Crotch. [2] It is classified as endangered due to the impacts of pesticides , climate change , and human development.
A bumblebee (or bumble bee, bumble-bee, or humble-bee) is any of over 250 species in the genus Bombus, part of Apidae, one of the bee families. This genus is the only extant group in the tribe Bombini , though a few extinct related genera (e.g., Calyptapis ) are known from fossils .
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Bombus terrestris, the buff-tailed bumblebee or large earth bumblebee, is one of the most numerous bumblebee species in Europe.It is one of the main species used in greenhouse pollination, and so can be found in many countries and areas where it is not native, such as Tasmania. [2]