Water achieves its highest density—that is, its molecules are the most packed together—at 4°C.

TLS Online TPP Program

#Id: 9832

#Unit 6. System Physiology – Plant

Phytochrome interacting factors (PIFs) are a family of proteins that act primarily as negative regulators of photomorphogenic responses.

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#Id: 6732

#Unit 8. Inheritance Biology

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#Id: 2259

#Unit 11. Evolution and Behavior

Directional selection favors individuals at one extreme of a phenotypic distribution that have greater reproductive success in a particular environment.

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#Id: 7019

#Unit 5. Developmental Biology

Once stem cells become positioned farther from the niche, signaling factors cannot reach them, and differentiation commences.

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#Id: 9585

#Unit 11. Evolution and Behavior

Cretaceous - Diversity of angiosperms and Mass extinctions of marine and terrestrial life, including last dinosaurs