The evidence supporting the idea that modern birds and reptiles share a common ancestor is that feathers are a derived characteristic that first evolved in reptiles. Feathers represent an evolutionary derived trait.
In evolutionary biology, an autapomorphy is a distinctive phenotypic trait referred to as a derived trait, which is unique to a particular group/taxon.
The derived traits are phenotypic features that arise during the evolution of a particular taxonomic group.
These traits (derived traits) differ from the phenotypic trait of the ancestor of the group.
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I think the correct answer from the choices listed above is option A. The <span>geographic feature that is responsible for helping bring humans and dogs to North America would be the </span><span> Bering Sea land bridge. Hope this answers the question. Have a nice day.</span>
As per <span>Mendel studied seven pea plant </span>traits<span>, each with two contrasting characters. He crossed plants with each of the seven contrasting characters and studied their offspring. Each original pair of plants is the P (parental) generation.
True !</span>
Answer:
The control experiments have control variable the natural experiment control by nature lacks this
Explanation:
When a n experiment is set up to answer a particular questions,by subjecting the investigating subjects or individuals to experimental factors beyond the control of the investigator but control by nature,such experiment is said to be Natural.Since the investigator lacks control over the factors determining the experiments.,then natural experiment are observational studies.Therefore they are said to lack controlled variables.
In order to test hypothesis or theories,experiments can be set up by the investigator under certain regulated factors.Thus the variable to determine the effect on the subjects or individual of the investigating conditions can be manipulated by the investigator. Hence it can be said to have a control variable.The experiments is called control experiment.
Troposphere because it is at the very top. As u delve deeper, you get to the core which is the hottest part of the earth