Which of the following has a knot of nerve tissue at its head end?

a.

octopus.

b.

sponges.

c.

worms.

d.

bacteria.

How do you figure net force for opposite forces?

Bacterial cultures are sometimes exposed to ultraviolet (UV) light in order to generate organisms with new genetic traits. Why do microbiologists choose to use UV light for this purpose?

Terrestrial vertebrates use the urea cycle to convert the ammonium ion to urea such that the urea can be excreted. In the production of urea, only one of the nitrogens in the product comes from ammonium ions.

The female sex cells or eggs are produced by

Are predator-prey relationships density-dependent or density-independent limiting factors? explain

What is a theory in biology

How might damaged alveoli affect the o2 level in the blood

The electrons of an atom occupy one or more areas of space called

The nucleus and other organelles of a neuron are primarily housed in which part of the cell? axon dendrite glial cell cell body none of the choices is correct.

What does every letter of the mRNA strand correspond to? (there is no chain to go with this question)