What do echinoderms have instead of brains?

The vertebrae and cartilaginous discs of the spine are parts of which body system? A. circulatory system B. excretory system C. muscular system D. skeletal system

Conversion of a six-carbon carbohydrate to two pyruvic acid molecules with accompanying reactions that release atp and hydrogen atoms is called

15) Spinal interneurons prevent muscle antagonists from interfering with an intended movement by A) the process of reciprocal inhibition. 15) B) initiating a crossed extensor reflex. C) initiating a tendon reflex.

Height and natural selection in humans?

A species of ant lives in acacia tree horns the ant uses the thorns for shelter and attacks any leaf eating insect that tries to eat the acaci leaves

Rhizobia are bacteria that live on the roots of some plants, such as legumes like pea plants. Rhizobia convert an element in the atmosphere into ammonia. Identify and explain the type of relationship this represents.

A scientist is carrying out replication of DNA artificially in her laboratory. What will she use to join the gaps on the DNA strand? (a.) the enzyme DNA polymerase (b.) the enzyme DNA ligase (b.) an artificial adhesive compound

Which part of an atom has most of its mass

One of the challenges of wind power is that the ___ of wind ___ day to day depending on weather conditions

How does the human brain interpret and render the surroundings and state of the body?