Examine the seedless vascular plants from lab today. Draw a representative observation of a stem and/or leaves from each group, as well as any evidence of sexual reproduction (i. e., spore production), if present. Describe how you used your observations to determine that your specimen is a lycophyte, horsetail, or fern (i. e., what features from your drawing allow you to differentiate between these three groups

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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the glands which are associated with each description is given below:

the contamination

we are putting to many trash.

d. planting trees

the trees take in carbon to make oxygen.