What effect does a chemical reaction have on the mass of a system

A 25 foot long ladder is propped against a wall at in angle of 18 with the wall how high up the wall does the ladder reach

When you're wearing a big sweater, what kind of energy is keeping you warm? A chemical energy B thermal energy C sound energy D kinetic energy

Towns and cities require large amounts of energy to meet citizens' needs. This energy is used for items like traffic lights, street lights, and automatic bridges, which keep people safe and allow traffic to flow smoothly.

The angular difference between true north and magnetic north is called.

What is the main cause of competition between two species? A. An overlap in the species' niches B. The extinction of one species C. Genetic drift in both species D. An increase in biodiversity in one species

What is a likely consequence of continued human population growth?

Why is an organisms role important for its community?

Briefly describe what is meant by the semiconservative nature ofDNA replication?

Why do sex-linked traits follow different patterns of inheritance than other traits? Apex

Some animals, like birds, reproduce by fusion of cells. Before a bird hatches, what protects the bird as it develops?