Questions | 5 |
Topics | Cell Division, Cirrus Clouds, Domain, Tertiary Consumers, Veins |
Cell division is the process by which cells replicate genetic material in the nucleus. Cell division consists of several phases:
Phase | Major Process |
---|---|
interphase | chromosomes replicate into chromatids and the cell grows |
prophase | chromatids pair up |
metaphase | paired chromatids move to opposite sides of the cell |
anaphase | cell elongates and nucleus begins to separate |
telophase | separation of nucleus is complete resulting in two new nuclei |
cytokinesis | cytoplasm and cell membranes complete their separation resulting in two separate cells |
Cirrus clouds are thin, wispy high-altitude clouds composed of ice crystals that originate from the freezing of supercooled water droplets. Cirrus clouds generally occur in fair weather and point in the direction of air movement at their elevation.
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
Tertiary consumers eat primary consumers and secondary consumers and are typically carnivorous predators. Tertiary consumers may also be omnivores. Examples include wolves, sharks, and human beings.
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.