Answer:
D. 3:1
Explanation:
Gregor Mendel, in one of his numerous studies, performed a cross between purebred dominant (TT) pea plants and purebred recessive (tt) pea plants. All the offsprings of this cross appeared heterozygous tall (Tt) in the F1 generation.
However, when he self-crossed the F1 generation i.e. Tt × Tt, Mendel obtained a phenotypic ratio of 3 tall plants (dominant traits) : 1 short plant (recessive). This showed that the masked gene (recessive) was still present.
Answer: The sun
Explanation: Primary producers obtain their energy via the sun through the process of photosynthesis.
B, hormones that serve as chemical messengers im not 100% sure though
Hydrocarbons. (organic compounds entirely made up of hydrogen and oxygen)
It's A. Temperature changes modify the enzyme shape, so they no longer fits.