Answer:
There are many types of evidence which support the theory of evolution such as comparative anatomy, fossil records, phylogenetic relationship, embryology et cetera
Comparative anatomy includes homologous organs and analogous organs. They support divergent and convergent evolution respectively.
For example, the homologous structure of limb of humans, birds, bat, horse, whale et cetera show that they are made up of the same set of bones which are humerus, radius, ulna, carpals, metacarpals, and phalanges.
It shows divergent evolution and supports that these organisms have evolved from a common ancestor.
Embryological evidence: When early stages of embryological development of different organisms are compared, it is found that these stages are similar at different levels of development.
For example:
- The appearance of pharyngeal-arch (gill-like structures) in vertebrates during embryo development.
- Salamanders and terrestrial frogs pass through larval stages within an egg. They possess the features similar to aquatic larvae, however, when they hatched out the eggs being ready for life on land.
A population in a community means the specific kind of organism(plants and animals) living in a community (all the living things in an ecosystem)
It is important for doctors to considers age when diagnosing endocrine disorders because the body produces different amounts of certain hormones at different ages. Example: you would find lesser amounts of sex hormones in children than adults. If these hormones are detected early in a child it can be a sign of a more serious problem. If these hormones are too low in adults it could be a sign of a more serious problem.
it is important for doctors to consider sex when diagnosing endocrine disorders because hormone amounts vary amongst sexes. Example: males produce more testosterone than females, females produce more estrogen than males. If either gender were to produce to much of its lesser hormone/not enough of its main hormone it could cause opposite sex characteristics. depending on gender, doctors would go take a different course of action.
Answer:
The K-T boundary in Zumaia, Spain is sharp--representing an abrupt change in the marine ecosystem.
The K-T boundary separates rock layers of the Cretaceous period from those of the Tertiary period.
The K-T boundary dates to 65 million years ago (when the dinosaurs disappeared)
Explanation:
The Cretaceous-Tertiary (K-T) extinction is the period between the mass extinction of plants and animals about 66million years ago. Based on geological records the interval between the Cretaceous period and the present day Tertiary period is marked by a boundary is called K-T boundary.Based on carbon dating this has been estimated to be 65.5 million years ago.
Evidences has shown that, this boundary must been created by asteroid -Chicxulub Crater and its impacts must have killed all green plants due to the clouds it produced which blocked sunlight penetrations. This decimated the dinosaur population due to lack of photosynthesis.
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