The Animal Book
Chapter 1: Animal characteristics
Chapter 2: Body Parts
Body plans refer to similarities in development, structure, and function among members of a particular group (phylum). At some point, members of that group share the same body plan during their development process. Which could be a possible explanation for shared structural plans that have been observed in the anatomy and embryology. Timing, pattern, and scale of development determine the organism's shape, and closely related groups are more likely to share structural and developmental similarities than those that are more distantly related. Homologous structures and developmental stages (those that are similar among related groups because they are inherited from a common ancestor) are the basis of modern biological classification.
Chapter 2: Body Parts (cont.)
There are three types of symmetry: radial symmetry, bilateral symmetry, and asymmetry. Animals with radial symmetry have no right or left sides, only a top or bottom (usually marine organisms). Animals with bilateral symmetry with a line of symmetry dividing their body into left and right sides have a top and bottom along with a top and bottom (all true animals are bilaterally symmetrical except those that are radially symmetrical). …show more content…
In classifying fossils, however, other features must be used, since soft tissue glands and many other features are not visible in fossils. Many traits shared by all living mammals appeared among the earliest members of the group: jaw joint, middle ear, tooth replacement, prismatic enamel, and occipital condyles. Most mammals are viviparous: giving birth to live young. Mammals can be herbivorous (eating plants), carnivorous (eating animals), or omnivorous (eating both plants and animals). Some examples include deer, bears, Homo sapiens;
Chapter 1: Animal characteristics
Chapter 2: Body Parts
Body plans refer to similarities in development, structure, and function among members of a particular group (phylum). At some point, members of that group share the same body plan during their development process. Which could be a possible explanation for shared structural plans that have been observed in the anatomy and embryology. Timing, pattern, and scale of development determine the organism's shape, and closely related groups are more likely to share structural and developmental similarities than those that are more distantly related. Homologous structures and developmental stages (those that are similar among related groups because they are inherited from a common ancestor) are the basis of modern biological classification.
Chapter 2: Body Parts (cont.)
There are three types of symmetry: radial symmetry, bilateral symmetry, and asymmetry. Animals with radial symmetry have no right or left sides, only a top or bottom (usually marine organisms). Animals with bilateral symmetry with a line of symmetry dividing their body into left and right sides have a top and bottom along with a top and bottom (all true animals are bilaterally symmetrical except those that are radially symmetrical). …show more content…
In classifying fossils, however, other features must be used, since soft tissue glands and many other features are not visible in fossils. Many traits shared by all living mammals appeared among the earliest members of the group: jaw joint, middle ear, tooth replacement, prismatic enamel, and occipital condyles. Most mammals are viviparous: giving birth to live young. Mammals can be herbivorous (eating plants), carnivorous (eating animals), or omnivorous (eating both plants and animals). Some examples include deer, bears, Homo sapiens;