Question

I will give a medal to anyone who has the answers to the Lesson 15: Building the Tree of Life assessment.

Answer 1

What questions are you stuck on?

Also, don't expect everybody here to be taking the same course as you do. Please post questions, not a reference to a specific course, unless you're in the study group of that particular course (OCW to be the perfect example)

Answer 2

1. In Linnaeus's time, all living things were grouped into two kingdoms. Later, there were five kingdoms, and now we have six kingdoms. What is the main reason for this increase in the number of kingdoms? (1 point)
Scientists have discovered organisms that were previously unknown, so new kingdoms had to be created for them.
Kingdom Plantae had to be split up into several kingdoms when scientists found that not all plants can photosynthesize.
As scientists learned more about genetics and biochemistry, some organisms were moved out of existing kingdoms and into new ones.
Since the time of Linnaeus, many new organisms have evolved, and most of them don't fit into the original kingdoms.
2. Why is the kingdom Protista not valid under evolutionary classification? (1 point)
Protists are all very similar and easy to confuse.
Protista contains groups that share closests common ancestors with other groups, rather than with each other.
Protists are the most numerous organisms on Earth.
Protista evolved before any other kingdom, and as such share a most recent common ancestor with each other, as opposed to any other group.
3. The three-domain system arose when scientists found that Eubacteria and Archaebacteria were more (1 point)
like Eukaryotes.
similar than scientists thought.
dissimilar than scientists thought.
like Fungi.
4. What does the tree of life represent? (1 point)
the current hypothesis of the evolutionary relationships between organisms
the relationship between different taxa in the three domains based on DNA evidence
the Linnaean relationships between kingdom, phylum, class, order, family, genus, and species
only the clades that include living organisms
5. Which of the following correctly lists the kingdoms of life scientists currently use? (1 point)
Terapoda, Aminota, Mammalia, Carnivore, Felidae
kingdom, phylum, class, order, family, genus, species
Bacteria, Archae, Eukarya
Eubacteria, Archaebacteria, "Protista," Fungi, Plantae, Animalia