Amphibians like frogs have a three-chambered heart (two atria, one ventricle) with some mixing of blood. Humans and pigeons have four-chambered hearts, crocodiles uniquely have a four-chambered heart among reptiles.
Explanation:
The fluid mosaic model (Singer-Nicolson) depicts the cell membrane as a phospholipid bilayer with embedded proteins, carbohydrates, and cholesterol, giving it fluidity.
Explanation:
Fertilization typically occurs in the ampulla, the widest region of the fallopian tube, where the sperm meets the secondary oocyte. The zygote then travels to the uterus for implantation. The ovary releases the egg, the uterus supports embryo development, the cervix is the lower portion opening into the vagina.
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