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There is no difficulty in explaining how a structure such as an eye or a feather contributes to survival and reproduction; the difficulty is in thinking of a series of steps by which it could have arisen.
could have
For example, it is possible to see that in January this person weighed 60.8 kg for eight days.
it is possible to see that
For example, it may be necessary for the spider to leave the branch on which it is standing, climb up the stem, and walk out along another branch.
may be necessary
Escherichia coli , when found in conjunction with urethritis, often indicate infection higher in the uro-genital tract.
often indicate
There is experimental work to show that a week or ten days may not be long enough and a fortnight to three weeks is probably the best theoretical period.
probably
Conceivably, different forms, changing at different rates and showing contrasting combinations of characteristics, were present in different areas.
Conceivably
One possibility is that generalized latent inhibition is likely to be weaker than that produced by pre-exposure to the CS itself and thus is more likely to be susceptible to the effect of the long interval.
One possibility is that
For our present purpose, it is useful to distinguish two kinds of chemical reaction, according to whether the reaction releases energy or requires it.
it is useful to
It appears to establish three categories: the first contains wordings generally agreed to be acceptable, the second wordings which appear to have been at some time problematic but are now acceptable, and the third wordings which remain inad
It appears to
Despite a number of minor problems, on the whole, the scheme was very successful.
on the whole
Coral reefs seem to be seriously affected by rises in sea temperature.
seem to be
Solar power offers a possible solution to producing clean, relatively cheap energy in developing countries.
possible
The study suggests that bilingual children may/typically have better memory skills than children who only speak one language.
suggests that
