What does it mean for a membrane to be selectively permeable?f the structure that is represented in the image?

The activity of the modern sample is 1.10 bq . how long does that measurement take?

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?

Why is the statement not a hypothesis? sunflowers require soil and plenty of sunlight and water to grow and thrive.