Answer:
A.
Explanation:
The arctic soil is so cold that the ground beneath the tundra surface remains frozen all year. This permanently frozen ground is called permafrost. Each summer, when the sun warms the tundra surface, the top few inches of soil thaw. This melted part is called the active layer.
Answer:
Compare the transformation of a bacterium cell with the transformation of a plant cell.
Explanation:
Men have testicles, and a scrotum. Women have ovaries, uterus and a vagina. Also women have wider pelvises than men so that they can have children.
Density-Dependent Factors. Which is a limiting factor that depends on population size.
