Question

can you answer these
What is the most likely reason that horses and mountain goats have hooves?
They have homologous structures because they have a common ancestor.
They have analogous structures because they have a common ancestor.
These are vestigial structures in both animals because they are not used.
These are similar structures due genetic mutations.

Studying the anatomy of different organisms allows scientists to determine how different species have evolved over time.

An eagle. A butterfly.

Which type of anatomic structure are bird wings and butterfly wings when compared to each other?
vestigial
homologous
analogous
heterologous

Biology shows us the fossil record and comparative anatomies. Chemistry shows us that organic molecules can come from inorganic matter. Geology shows us that organisms that used to live together are found on separate continents due to continental drift. Which fields of science provide evidence for evolution?
biology only
biology and chemistry only
biology and geology only
biology, chemistry, and geology

Marsupials are found in North America and Australia, but they would not have been able to swim across the ocean. According to scientists, how did this group of organisms come to live on two separate continents?
Marsupials used to have adaptations that allowed them to swim but lost these adaptations over time.
The two groups of marsupials evolved independently of one another on two separate continents.
The continents were once connected, and marsupials were able to migrate over the land.
The oceans were shallow in prehistoric times, which allowed the marsupials to travel from one continent to another.

Wisdom teeth are the third and final set of human molars that come in during the late teens or early twenties. In some cases, these teeth come in without problems, but they often have to be removed due to misalignment in the jaw, as shown below. Removal of the teeth does not cause any long-term complications in regard to eating.

An x-ray image of the mouth.
Which type of anatomic structure are wisdom teeth?
vestigial
homologous
analogous
heterologous

Answer 1

1) Horses and mountain goats have hooves — They have homologous structures because they have a common ancestor.
- Both are mammals whose limbs/digits are modified from the same ancestral structure.

2) Bird wings vs. butterfly wings — analogous
- Wings serve the same function (flight) but evolved independently in vertebrates and insects.

3) Which fields provide evidence for evolution? — biology, chemistry, and geology
- Fossils and comparative anatomy (biology), origin of organic molecules (chemistry), and continental drift/fossil distribution (geology) all contribute.

4) How did marsupials come to live on separate continents? — The continents were once connected, and marsupials were able to migrate over the land.
- Continental connections/land bridges allowed migration before plates separated.

5) Wisdom teeth — vestigial
- Third molars are reduced/unused in many modern humans and can be problematic, indicating a reduced ancestral function.