Which structure connects a placenta to an embryo?

cervix

fallopian tube

vagina

umbilical cord

Which proses occurs in a human muscle when it is forced to make atp without oxygen

What is a science explain

A radio tower emits energy in the form of waves. These waves travel great distances. Some of them even leave Earth and travel through the vacuum of outer space. What type of energy is described above?

How is a brain injury classifled?

What led to the dramatic decline in the biodiversity of agricultural crop species?

In pea plants, smooth pea shape is dominant to wrinkled pea shape. If a pea plant that is true-breeding for smooth pea shape is crossed with a pea plant that is true-breeding for wrinkled pea shape, what will be true of the offspring?

Are atoms completely lost or gain in a chemical re

Epinephrine and norepinephrine that are released from the adrenal glands affect target tissue for a longer period of time than the same substances released from neurons at their peripheral receptors. why?

Interpret this phrase: "we respire because our cells respire"

What are the two reasons for the change in the population of the giraffes?