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Categorizing organisms using dichotomous key

I have already categorized the following "Groups of Organisms," except for DOLPHINS. Where would it be placed in the problem below?

bats monkeys Euglena

lemurs sponges amphibians

dolphins Ginkgo biloba jellyfish

reptiles birds beavers

echinoderms tarsiers photosynthetic bacteria

a) production of milk for the young (reproductive, physiological)
Characteristic of all mammals

b) high cognitive ability, to reason, to fasion tools (neurological)
Specific to humans

c) inability to generate carbohydrates by means of photosynthesis (metabolic)
Characteristic of all animals

d) possessing bilateral symmetry (morphological)
Characteristic of all animals

e) upright, semi-upright posture (morphological)
Specific to humans

This definition of humans excludes all primates as they lack of a high cognitive ability and cannot walk upright or in a semi-upright posture unassisted.

Problem
Most fundamental to most definning
c) inability to generate carbohydrates by means of photosynthesis (metabolic)
d) possessing bilateral symmetry (morphological)
a) production of milk for the young (reproductive, physiological)
b) high cognitive ability, to reason, to fasion tools (neurological)
e) upright, semi-upright posture (morphological)

Exclusion of animal groups by each characteristics WHERE IS DOLPHINS PLACED?
c) inability to generate carbohydrates by means of photosynthesis (metabolic)
Excludes: Photosynthetic bacteria, Euglena (a protist with chloroplast), Ginkgo biloba (tree),

d) possessing bilateral symmetry (morphological) (bilateral=left and right side that are non-identical)
Excludes: Echinoderms (starfish are radial, many sides that are identical), sponges (also radial), jellyfish (radial)

a) production of milk for the young (reproductive, physiological)
Excludes: Birds, reptiles, amphibians

b) high cognitive ability, to reason, to fasion tools (neurological)
Exludes: Bats, tarsiers, lemurs,

e) upright, semi-upright posture (morphological)
Excludes: Monkeys, Beavers

Beavers are known to use their tails as communication tools though this may be debatable characteristics included in b).

Solution Preview

Your question and my response are listed below. I've also attached this entry in Microsoft Word format. Good Luck!!

QUESTION:

Categorizing groups of organisms

I have already categorized the following "Groups of Organisms," except for DOLPHINS. Where would it be placed in the problem below?

bats, monkeys, Euglena, lemurs, sponges, amphibians, dolphins, Ginkgo, biloba, jellyfish,
reptiles, birds, beavers, echinoderms, tarsiers, photosynthetic bacteria

Exclusion of animal groups by each characteristics WHERE IS DOLPHINS PLACED?

c) inability to generate carbohydrates by means of photosynthesis (metabolic)
Excludes: Photosynthetic bacteria, Euglena (a protist with chloroplast), Ginkgo biloba (tree),

d) possessing bilateral symmetry (morphological) (bilateral=left and right side that are non-identical)
Excludes: Echinoderms (starfish are radial, many sides that are ...

Solution Summary

In this solution I organize organisms into the appropriate phylogenetic categories using the describes in a provided key, defining terms as needed. The organisms include: bats, monkeys, Euglena, lemurs, sponges, amphibians, dolphins, Ginkgo, biloba, jellyfish, reptiles, birds, beavers, echinoderms, tarsiers, and photosynthetic bacteria.

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