Which animal phylum was the first to develop a dorsal nerve cord a backbone?

Select the correct answer.which scenario describes unethical lab behavior? o a. danny stores the chemicals required for his experiment in flasks and beakers.b.anna publishes the results of her experiment on the growth rate of saplings.c.jason repeatedly runs an experiment until he gets the results he desires.d. mia records her observations of an experiment precisely and accurately.

Agene editing technology called crispr-cas9 uses cellular machinery to change the cell's genetic material. how might this technology be useful in treating diseases like cancer?

How does the human body lever work?