Which of the following would be the latest in the development of a human fetus?

bone starts to replace cartilage to form the beginnings of a skeleton

the fetus grows to reach approximately eight centimeters in length

cells divide into the endoderm, mesoderm, and ectoderm

the nervous system begins to develop and can control basic body functions

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.

Why zebra fish experience similar genetic disease as human