Identify the genotypes of male and female fruit flies, birds and grasshoppers.

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

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?