Applying for Glasgow Uni

Looking to study marine biology at UofG however I am confused about entry requirements. I have the S5 standard requirement to be reviewed for S6 however it is asking for 5As and the most that I am able to get is 4. Should i still consider applying or should i try to find other courses elsewhere as I am less likely to get in. The website is confusing me as it doesnt have set in stone entry requirements