Atoms have a surrounded by

A. positive electron, negative nuclei
B. negative electron, positive nuclei
C. negative nucleus, positive electrons
D. positive nucleus, negative electrons

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.

Afive-year study was carried out on a population of algae in a lake. the study found that the algae population was steadily decreasing in size. over the five-year period this decrease most likely led to