In a cross-bed, the bottoms of rock layers are curved due to the bottoms being eroded. true false

Biogeography is the study of a where species and their ancestors live. b how extinct species can be related to living species. c how different species can interbreed. d how animals that live in the same area are closely related.

What are hydrogen and covalent bonds

2) Macromolecules, which perform a multitude of functions that are vital for life, exist in many different shapes and sizes. Which of the following statements about macromolecules is false?

What is the oldest planet in the universe? How did scientists arrive at this conclusion?

Suppose you were a superhero that could fly up through the atmosphere while feeling the temperature and air pressure change around you. describe your trip

Which of the following is a true statement? A. Individuals evolve to have adaptations. B. Individuals have adaptations that can change over time. C. Individuals have traits that may or may not make them successful at reproduction. D.

What is the purpose of the glycoprotein spikes found on some enveliped viruses

There are several ways that a mutation may occur. Which of the following not a way for a mutation to occur during the DNA replication copying process? A. Sections of genes can be removed B. Sections of genes may be added C.

How do the resurection of fern, crysts of brine shrimps and tardigrade survive with no water?

Which of these best describes Earth's mantle? A. Most dense layer, consists of the outer and inner parts B. Thinnest under the oceans and thickest under continents C. Middle layer, density increases with depth as pressure increases D.