Dogs have a reduced nonfunctional digit on their paws known as a dewclaw. What is this an example of? analogous structure
homologous structure
vestigial structure
mutated structure

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

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.