Why is reproductive isolation required for specification to occur

In sexual reproducing animals once fertilization of the egg takes place, the exists as a single cell until cell division begins. a) egg b) larva c) sperm d) zygote

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

Approximately what portion of the foods that we eat have been genetically modified in some way? a. fewer than 10% b. about 50% c. nearly 100%