The placenta (also known as afterbirth) is an organ that connects the developing fetus to the uterine
wall to allow nutrient uptake, provide thermo-regulation to the fetus,
waste elimination, and gas exchange via the mother's blood supply, fight
against internal infection and produce hormones to support pregnancy.
The placenta provides oxygen and nutrients to growing babies and removes
waste products from the baby's
During contraction, the filaments slide past he thick filaments, shortening the sarcomere. The thick and thin filaments do the actual work of a muscle, and the way they do this is pretty cool. Thick filaments are made of a protein called myosin. At the molecular level, a thick filament is a shaft of myosin molecules arranged in a cylinder. Thin filaments are made of another protein called actin. The thin filaments look like two strands of pearls twisted around each other.
The answer to this would be D: eats mostly or only foods that are plant-based. this would be because all the others are false, vegetarians can get all the essentials from plants and nuts and stuff, they just don't eat meats.
-hope this helps :3
It is an embryo because a zygote is just a cell and it turns into a fetus after 8 weeks
