Classification is the arrangement of organisms into similar or related groups. We classify living things based on evolutionary relationships and similarities in their biological structures, beginning with the most general. Once an organism is classified, it can be given a scientific name. Taxonomy is the science of identifying, classifying and naming living things. The classification tree in the video looks like there are only a few phyla. In reality, each kingdom branches into many phyla—we just didn’t have room to show all of them! The kingdom of Animalia alone contains over 30 phyla. These include Echinodermata, which means “spiny skin” and contains organisms like sea urchins and starfish; Annelida with long, segmented bodies like earthworms; and Chordata with spinal cords, like humans. Each phylum branches into many classes and each class into many orders, and so on down to species. There are 1,470,000 species in the animal kingdom in total.

Which of the following best describes the relationship between kingdoms and phyla?

A
There is always an equal number of kingdoms as phyla.

B
A single phylum branch out into over 30 kingdoms.

C
Each of the six kingdoms has exactly 30 phyla in it.

D
Many different phyla make up each kingdom.

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5