The gray crescent region of the amphibian zygote is thought to contain

A) growth factors and developmental determinants.
B) hormones and ribosomes.
C) yolk and dark pigment granules.
D) mitochondria and ribosomes.
E) neurotransmitters and hormones.

Gray Crescent

The grayish area of cytoplasm that marks the region where gastrulation begins in an amphibian embryo

Developmental Determinants

Factors that influence the growth and differentiation process of an organism from its embryonic stage to maturity.

Growth Factors

Naturally occurring proteins capable of stimulating cellular growth, proliferation, healing, and cellular differentiation.