Whatever introductory biology class you decide to take, you should take chemistry now , including lab, in your first year. You can take introductory biology at the same time, although most students wait until their second year. Majors in the biological sciences may start with either class. C2001 may be taken in the first or second year, while C2005 is generally taken in the second year because it has a prerequisite of 1 year of college chemistry. If you absolutely cannot face chemistry now, then you should start with ENVB C2001 in your first term and take chemistry later.
Biologists use chemistry as language, the way physicists use math.
You can explain physics without math, or biology without chemistry, but it takes a lot longer and the explanations are not as satisfying. So we either have to teach chemistry as we go along, or ask students to take chemistry before biology. If you achieved an AP5 in chemistry, you may consider taking BIOL C2005 in your first year. Otherwise, if you jump straight into Biology C2005 without a year of college chemistry, you are likely to find the chemical details overwhelming. . The two terms can be taken in either order.