Human organ that takes up only 2% of a body’s weight but uses about 20% of its energy

The answer to “Human organ that takes up only 2% of a body’s weight but uses about 20% of its energy” in LinkedIn Crossclimb on Sunday, August 9, 2026 is BRAIN — a 5-letter word, and rung 5 of that day's ladder. Crossclimb is a word ladder, so this isn't just a trivia answer: BRAIN has to fit both the clue and the one-letter chain running through the puzzle. Below you'll find why it fits, exactly where it sits in the ladder, and links to the day's other clues if more than one rung is giving you trouble.

“Human organ that takes up only 2% of a body’s weight but uses about 20% of its energy” answer

The Crossclimb answer for “Human organ that takes up only 2% of a body’s weight but uses about 20% of its energy” (Sunday, August 9, 2026) is:

BRAIN

You can also reveal it one letter at a time with the tiles above if you'd rather keep some of the challenge.

Why the answer is BRAIN

From BRAWN you change the fourth letter of BRAWN from W to I to reach BRAIN, then change the first letter of BRAIN from B to T to get TRAIN.

How BRAIN fits the ladder

Crossclimb stacks 7 words where each one changes a single letter from the word above it. Here's the full ladder for August 9, 2026, with “Human organ that takes up only 2% of a body’s weight but uses about 20% of its energy” highlighted:

BRAIN sits at rung 5: from BRAWN you change the fourth letter of BRAWN from W to I to reach BRAIN, then change the first letter of BRAIN from B to T to get TRAIN. Each neighbouring rung is exactly one letter away, which is how you can derive BRAIN even if the clue alone stumps you — solve a neighbour and the single-letter rule points straight here.

More clues from this Crossclimb puzzle

Stuck on another rung? Here are the other clues from the August 9, 2026 ladder — tap any for its answer and where it sits in the chain:

• Black birds that collectively form a “murder” → CROWS
• The top part of the head, or something one might put there → CROWN
• Cook until the color changes, as onions → BROWN
• Muscular strength → BRAWN

Want the whole ladder in one place, including the top and bottom words? The full August 9, 2026 solution is on that day's Crossclimb answers page, and today's live Crossclimb answers are always one tap from the main Crossclimb page.

About LinkedIn Crossclimb

Crossclimb is one of LinkedIn's daily games: solve short trivia clues to fill a ladder of words, where each word changes just one letter from the one above it, then order the rungs so the chain holds. Completing the middle rungs unlocks the top and bottom words, which are easier because they must fit the letters already in place. A new puzzle drops every day at midnight Pacific Time (3:00 a.m. Eastern), and it's free to play at LinkedIn Games. This was a Sunday puzzle.

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