Collagen is a part of the connective tissue that in the skin helps in firmness, suppleness and constant renewal of skin cells. Collagen is vital for skin elasticity. Ligaments are another type of connective tissue that attach two bones and consequently hold the joints together.
There are at least 33 phyla (plural of phylum) of animals. Humans are members of the phylum Chordata. All of the chordates have elongated bilaterally symmetrical bodies. That is to say, the left and right sides are essentially mirror images of each other.
A bacteria cell is an organism. Humans have eukaryotic cells and are therefore in the Eukarya Domain. Domains are large groupings that include multiple kingdoms. Eukarya are all the eukaryotes, including animals, plants, fungi, and protists.JJ's*Mommy Â· 6 years ago. Thumbs up. 0.Thumbs down.0.oth a bacteria cell or an oak leaf is an organism Humans belong to animals In biology, an organism is any living system (such as animal, plant, fungus, or micro-organism).