Question

Zebrafish (Danio rerio) are especially useful in the study of early development because their embryos_________.

1) are exceptionally large
2) develop slowly
3) are transparent
4) are naturally fluorescent

Answer 1

Zebrafish embryos are particularly valuable in developmental biology because they are transparent, allowing for direct observation of their development.

Step-by-step explanation:

Zebrafish (Danio rerio) are especially useful in the study of early development because their embryos are transparent. The transparency of zebrafish embryos allows researchers to directly observe the developmental processes as they occur. This characteristic, alongside their relatively rapid development, contributes to their use as model organisms in developmental biology.

Zebrafish embryos are not exceptionally large, do not develop slowly, and are not naturally fluorescent, although researchers often use fluorescent markers to study specific structures within the embryos. Their bilateral symmetry, and the ability to study cellular and sub-cellular levels thanks to advanced imaging techniques, also play a role in their importance for developmental studies.