Self-paced · Biology EOC Tutoring

Bridge: carbon budgets, sinks and sources

Supplemental unit for this edition only, separately reviewed for the narrow sampled skill. The initial course diagnostic remains separate. Applications are unscored self/human review, and objective results do not establish mastery, STAAR readiness or course credit.

1 focused skill · About 30 minutes · Untimed

Find a starting point

A short diagnostic

Answer 2 questions before studying. Two questions sample each skill; an unanswered skill is not a failed skill. You can change answers until you check them.

Synthetic complete one-year land–air budget: uptake 94, respiration/decomposition 73, burning 6, all in metric tons of carbon per year. Which classification follows?

Sink of 15Source of 15Sink of 21Source of 79

A land area releases 18 more metric tons of carbon than it takes in during one year. Which claim is justified?

It contains no carbon after that year.Photosynthesis has stopped completely.It is a net source for that year and boundary.The released carbon atoms were created by burning.

Coverage and sources

Not covered by this unit

This bridge does not replace retained course instruction or cover every part of its listed standard.
This is not an official TEA assessment. The two-item recheck cannot establish broad proficiency.
Writing is saved for self or educator review, not automatically evaluated for quality.

MasteriTrail instructional material, with attributed source selections where noted, aligned to selected skills in the TEA resources below. Not an official test and not endorsed by TEA.

TEA Biology assessed curriculum, B.13(C), page 6 ↗ · Source checked 2026-10-27

NOAA: carbon cycle ↗ · Source checked 2026-10-27

NOAA Global Monitoring Laboratory: sources, sinks and fluxes ↗ · Source checked 2026-10-27