i'm new in the site and making stock and i want to know why my photos are rejected
Please tell us the reason as given by the moderator.
Looking into your pictures: Bad composition (crab and boat), missing detail and washed out colours (crab and boat) and noise (cat).
If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
In my opinion you need to concentrate more on good compostion. For instance:
the subject is way to small which ruins the composition