Why are viruses considered to be nonliving? A. They have no genetic material.

B. They cannot reproduce without a host cell.

C. They do not respond to their environment.'

D. They cannot use energy.

B. They cannot reproduce without a host cell.

It is considered to be nonliving as it cannot reproduce on its own.

Explanation:

Without a host cell they are unable to reproduce as it does not have the necessary reproductive tools.

It reproduces by using the host cell's reproductive tools by taking control of it.

Viruses also don't need energy as living organisms do. So the answer may be D. as well.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.