hich of the following taxonomic groups includes the greatest number of organisms?(1 point)
Responses
domain
domain
family
family
phylum
phylum
species
What is the primary purpose of a dichotomous key?(1 point)
Responses
identify unknown organisms
identify unknown organisms
observe microscopic structures
observe microscopic structures
discover new species
discover new species
update Linnaean classification system
identify unknown organisms
What do scientists examine when they use a dichotomous key?(1 point)
Responses
kinds of foods eaten by an organism
kinds of foods eaten by an organism
observable features of an organism
observable features of an organism
environment of an organism
environment of an organism
behaviors of an organism
observable features of an organism
Examine the two spiders.
Two spiders, side by side. One spider is black with eight segmented legs and a long, thin body. The other spider is brown with eight segmented legs and a short, wide body.
Which characteristic would best identify the spiders as belonging to different species?
(1 point)
Responses
number of legs
number of legs
presence of wings
presence of wings
type of diet
type of diet
shape of body
shape of body
Use the dichotomous key to answer the question.
Dichotomous Key
1a. Needle leaves: go to step 2
1b. Non-needles leaves: go to step 3
2a. Needles are grouped in clusters: pine tree
2b. Needles are individually arranged: spruce tree
3a. Simple (individual) leaves: go to step 4
3b. Compound leaves (leaflets): go to step 5
4a. Leaf edge is smooth and lobed: oak tree
4b. Left edge is rough and tooth-like: elm tree
5a. Leaflets are attached at one point: chestnut tree
5b. Leaflets are attached at many points: walnut tree
Examine the leaf.
Non-needle green leaf with compound leaves attached at the center.
What kind of tree is the leaf from?
(1 point)
Responses
oak
oak
walnut
walnut
elm
elm
chestnut
chestnut