The sex hormones are considered from lipids and not from the simple sugars/because they
a. enter in the structure of plasmamembrane
b. are soluble in benzene
c. are soluble in water
d. are responsible for the appearance of secondary sex characters

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?

What is one affect on the australian environment due to the introduction of non-native european rabbits