biology questions, 10 pts for most correct answers?

I

ilovecheer

New member
explain the allopatric model and describe the machanisms that may lead to diverence of isolated gane pools.

PHYLOGENY AND SYSTEMATICS
1.distiguish between phylogeny and systematics
2.descibe the prscess of sedimetation and the formation of fossils. explain which protions of organisms are most likley to fossilize.
3. explain why is is crucial to distiguish between homology and analogy before selecting characters to use in the reconstruction of phylogeny.
4.explain why bird and bat wings are homologous as vertebrate forelimbs but analogous as wings
 
i learned this allll last byear.. im going into 8th grade.... the only one i know is,
2, barely.. the part of the organism is the bone or exoskeleton :) good luck
 
1. Systematics is a broader topic that includes phylogeny and taxonomy. Phylogeny is the classification of animals based on homologous structures using "tree graphs" called cladograms.
2. Sedimentation occurs at the mouths of rivers where particles of rock and sand can accumulate where the river exits. Sedimentation also takes place when landslides occur. The formation of fossils are usually created by rapid sedimentation such as landslides. Generally, the skeleton will be fosillized because it takes in the sediments surrounding it while the tissues and skins will decompose.
3. Homology occurs when two animals had a SIMILAR ancestor and developed possibly different body parts because they lived in different environments. Analogy occurs when two animals had DIFFERENT ancestors but developed similar parts because they lived in similar environments. Do not mistaken analogous body parts with homologous ones when making a phylogenetic tree.
4. The forelimbs are homologous as forelimbs because they shared a common ancestor and thus have a similar bone structure. However, they are analagous as wings because they developed into wings (as opposed to arms like ours or fins like fish) because they both needed to fly.
 
Back
Top