Heterotrophs conduct cellular respiration and use what 2 things? * 1. Water and Carbon dioxide
2. hydrogen and oxgyen
3. chemical and physical

Please answer

What type of cell is produced after fertilization occurs and the gametes combines ?

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

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?