A human DNA sequence is amplified by PCR in a population sample, and we observe five different alleles of 220 bp, 224 bp, 228 bp, 232 bp and 236 bp in length. This sequence is an example of a (choose one):
O 1.DNA profile
2. Minisatellite
O 3. SNP
4. Short tandem repeat (STR)

Will mark branliest. the theory of plate tectonics was developed with the contribution of scientists from many different disciplines. which of the following is a contribution from geophysicists?

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?