Answer:it’s A)
Explanation:I saw it on a quiezlet online lol
Earth's crust is made of rock, and rock is made of natural substances called minerals. There are three main types of rock: sedimentary, igneous, and metamorphic rock. Each type is produced in different ways. The oldest rocks on Earth were formed about 3.8 billion years ago.
The answer is Hox Genes. Just took the exam.