Which of the following gases were present in the atmosphere of 4 billion years ago?

a) water
b) methane
c) ammonia
d) all of the above

Can create a hboth of these instruments can measure wind speed. doppler radar and psychrometer anemometer and hygrometer doppler radar and anemometer radiosonde and psychrometer

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species

Explain how the parts of the peripheral nervous system work with the central nervous system to produce a response to the stimulus