The slight dilation of the cervix as the infant begins to push its way out of the womb triggers a receptor to send a message to the brain, which then directs the contraction of muscles to help the birth process along. These contractions increase dilation, which triggers additional, and more intense, contractions. This process is a good example of a
What theory best explains the wide variation in physical traits that you see among the thousands of people at a crowded festival or sporting event?
Which pictured animal is a cnidarian?
Monera (bacteria): Single-celled prokaryotic organisms; reproduce by binary fission (simple cell division); found in every habitat
Protista (protists): Single-celled eukaryotic organism; include plantlike, animal-like, and fungi-like organisms; reproduce by binary fission
Fungi: Single-celled and multicellular eukaryotic organisms; cells reproduce by either budding (forming a string of cells) or binary fission
Plantae (plants): Multicellular eukaryotic organisms with cell walls; make their own food from the Sun’s energy
Animalia (animals): Multicellular eukaryotic organisms without cell walls; ingest food and process it internally
The cells of eukaryotic organisms contain a distinct nucleus, and their DNA is organized into chromosomes. The cells of prokaryotic organisms lack these features.
In reproduction of yeast, a cell forms a “daughter” cell, and then the nucleus of the parent cell splits into a daughter nucleus, which migrates into the daughter cell. To which kingdom does yeast belong?