Explain why mutation and natural selection make development of new flu vaccines necessary every year

Which describes the independent variable in an experiment? the variable changed by the experimenter the quantity that must remain the same the variable that changes in response to the experiment the statement that is worded to test the experiment

Curare is a poisonous plant extract. curare molecules have a chemical structure like the neurotransmitter ach. curare can bind to the ach receptor site on the chemically gated ion channels in the motor end plate.

When a skeletal muscle generates enough force during contraction to shorten, when a skeletal muscle generates enough force during contraction to shorten, the sarcomere, the a band and the i band will shorten. only the a band will shorten.

What is a prokaryotes

Label the steps for protein synthesis in order, beginning with the first step. Can someone tell me which one is step 1 an 2 an 3 an 4 an 5 Once the protein is made, the gene for a particular trait is expressed.

A client at 42 weeks' gestation is 3 cm dilated and 30% effaced with membranes intact and the fetus at + 2 station. fetal heart rate (fhr) is 140 to 150 beats/minute.

Blood is composed of many tiny cells in a liquid called plasma. Blood is actually considered a colloid. The dispersed state of matter is, and the dispersion medium is

Forward chaining and backward chaining both involve:

The four main types of macromolecules are organic. What does organic mean in this context? O A. It is a very large molecule. O B. It is produced without the use of pesticides. O C. It is made from or produced by a living organism. O D.

9. You find a rock 7,500 km away from the nearest seafloor spreading center. The plate is spreading at 5 cm/year, how old is the rock? Give answer in years. (Hint: 100,000 cm = 1 km)