What is a group of cells that secrete substances into the blood or directly into an organ

Why is nitrogen essential to the growth of a fungus, but not to the spread of rust?

Mendieta used her own body in a tree of life project to suggest:

What do aerobic respiration and anaerobic respiration have in common?

What is the most destructive erosion all force

Describe the functions of two of the organs

What covers the ends of bones in adults? A blood B cartilage C marrow D ligaments

If gene expression control occurs during transcription, when did it occur?

If selfing starts in a previously randomly mating population composed of 0.50 heterozygotes, what is the frequency of heterozygotes after three generations of selfing

The movement of a bird away from a grass fire is caused by A) receptors initiating a stimulus B) impulse forming in a muscle tissue C) muscles responding to a stimulus D) effectors synthesizing neurotransmitters

What does a reflectd light look like