Using models to representing biological objects or events
• what are the advantages of using models like the ones from this unit?
• what are some of the limitations of the dna models used? are there
questions that cannot be answered using these models?
• animal models are another type of biological model commonly used in
research. what are some possible limitations of using animal models when
testing new medicines for humans?

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602