In which century was the DNA database established?

The DNA database was established in the

century

Dinosaur fossils are too old to be reliably dated using carbon-14, which has a half-life of about 5730 years. Suppose we had a 68 million year old dinosaur fossil.

Describe electronegativity, and explain the trend of electronegativity in the Periodic Table

How many significant figures are in 512.00 mL?

True or False? All waves transmit energy but not matter from one location to another

Which substance are acidic?

A concave lens is also called a diverging lens.

If one light bulb is removed from a parallel circuit with three bulbs, the brightness of the other bulbs will decrease.

If two objects collide and one is initially at rest, is it possible for both to be at rest after the collision? Is it possible for one to be at rest after the collision.

Big commercial airplanes are sometimes pushed to an area by a tractor. A 1800-kg tractor exerts a force of 1.75x 104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N.

Ferns that eject spores generally do so in pairs, with two spores flying off in opposite directions. The structure from which the spores are launched is quite lightweight.