b
I am not that sure but I think endocrine cell don't contain blood vessels
Explanation:
plants > herbivorous insects > predaceous insects > toads.
For plants, it's photosynthesis.
Answer:
The modern evolutionary synthesis defines evolution as the change over time in this genetic variation. The frequency of one particular allele will become more or less prevalent relative to other forms of that gene.
Explanation:
A substantial part of the phenotypic variation in a population is caused by genotypic variation.
