Down
1. an early developmental process through which the three germ layers of animal embryo are established.
2. beneficial partnership between two or more species.
Across
3. most members of this group of eukaryotic organism are photoautotrophs. (hint: not plants)
4. the sense of smell.
5. the opening of gastrula which can turn into mouth or anus later in development.
Answer 1. gastrulation 2. mutualism 3. algae 4. olfaction 5. blastopore
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