All four changes described in the passage are the result of human activity: clear-cutting forests, channeling fertilizer and sewage into rivers and oceans, overusing air pollutants, and allowing livestock to overgraze grasslands.
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?
A woman is most likely to get pregnant if she has unprotected sex a few days before and on the day of ovulation, when the egg is released from the ovaries. The release of the egg is hormonally stimulated,meaning that a hormone in the woman’s body triggers ovulation. On average, women ovulate around the 14th day of their menstrual cycle. The following is a graph show- ing the levels of three hormones throughout the menstrual cycle of an average woman.
Based on the graph, which hormone is most directly responsible for triggering ovulation?
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?