*Question*
You are presented with the question "What infects and destroys helper T cells?" and the following answer choices: - swea - Wasps - AIDS - CO 2 - PDAs - humans - heat - anemia Now knowing that hIV infects and destroys helper T cells and scientists agree that HIV causes Aids, choose the best answer.
**Answer**
AIDS

*Question*
You are presented with the question "Adult sponges produce sperm and what other sex cell?" and the following answer choices: - testicles - it needs them - gastropod shells - fertile - testosterone - zygotes - female gametes - barnacles Now knowing that adult sponges produce eggs and sperm and each ovule usually contains one egg , the female gamete or sex cell, choose the best answer.
**Answer**
female gametes

*Question*
You are presented with the question "How does a car engine create movement?" and the following answer choices: - Oil - Added pressure - electricity - activation energy - contracting - a hydraulic system - Burning water and salt - Burning fuel and air Now knowing that acar engine usually converts gasoline into motion and heat through combustion and an internal combustion engine burns a mixture of fuel and air, choose the best answer.
**Answer**
Burning fuel and air

*Question*
You are presented with the question "What do mold spores make it hard to do?" and the following answer choices: - clean house - motility - kill them - breathe - reproduce - eat bread - play outside - survive Now knowing that amold spore has a negative impact on the respiratory system and another name for the breathing tree is the respiratory system, choose the best answer.
**Answer**
breathe