A cell membrane is c.selectively permeable because it regulates what materials enter the cell.
Answer:
Explanation:
Human beings also compete with some animals for food. For example, humans fish the oceans, taking many fish for their own consumption. When they do so, they take fish that larger fish would otherwise have eaten. These are both instances of humans and animals competing for resources.
Mark me as brainiest
Answer:
Most animals obtain their nutrients by the consumption of other organisms. At the cellular level, the biological molecules necessary for animal function are amino acids, lipid molecules, nucleotides, and simple sugars. However, the food consumed consists of protein, fat, and complex carbohydrates.
Explanation:
Scientists developed the time scale by studying rock layers and fossils world wide.
Radioactive dating helped determine the absolute divisions in the time scale. so mass extinction help because there is more to study
