Which scientist discovered that dna is a double helix
by taking a x-ray of it?
a) watson and crick
b) franklin
c) darwin and lamarck
d) chargaff

Francis Harry Compton Crick

Explanation:

he was a British molecular biologist, biophysicist, and neuroscientist. In 1953, he co-authored with James Watson the academic paper proposing the double helix structure of the DNA molecule.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

what bodys are there orbiting?