Which of the following has a knot of nerve tissue at its head end?
a.
octopus.
b.
sponges.
c.
worms.
d.
bacteria.

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

What does the positioning of transcription factors determine?

There are multiple lines of evidence that provide support for common ancestry and evolution. write 3-4 paragraphs describing at least three of them in detail. provide at least one example for each line of evidence.