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

Dna is colied into chromosomes in a cell

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?