Flowering Locus C (FLC) is a gene that is responsible for flowering in certain plants FLC
is expressed in new seedlings, which prevents flowering Upon exposure to cold
temperatures, FLC expression decreases and the plant flowers. FLC is regulated through
epigenetic modifications.
What type of epigenetic modifications is present in new seedlings and after cold
exposure?

Explain how scientists use geologic time to determine the age of landforms.

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Why are current extinctions of concern to enviromentalists?