Echinoderms lack respiratory and excretory systems, and lung mechanics and gas exchange are topics during study of the respiratory system. Given these facts, what do Echinoderms lack among the following options: - Lungs - Mass - oxygen - eardrum - gills - ovaries - Organs - Bodies
Lungs

Scraping oneself on a contaminated object may cause infection, and any infection can cause death. Given these facts, scraping oneself on a contaminated object may cause among the following options: - mildew - Herpes - deadly - disease - Injury - blood - rabies - death
death

Q: Coal is used to produce electricity by burning in coal-fire power stations, and solid refined coal is easy to transport and can be used in coal-burning equipment. Given these facts, solid materials used to produce electricity by burning in what need to be transported firs among the following options: - Conifers - animals - it needs them - humans - heat energy - important habitats - power stations - batteries
A: power stations

Question: Playing is just one of many ways that mammals and other animals learn how to behave, and pugs are mammals and mammals shed. Given these facts, what is just one of many ways that pugs learn how to behave. among the following options: - humans - playing - sleeping - growing - Movement - sound - genetics - exercise
Answer: playing

*Question*
Cross-pollination increases genetic diversity, and biodiversity is basically genetic diversity. Given these facts, what increases biodiversity among the following options: - Reproduction - cross-pollination - By coral exoskeletons - gene flow - Quality of life - self-pollination - asexual reproduction - extinction
**Answer**
cross-pollination

Veins generally carry deoxygenated blood, and arteries and veins are blood vessels. Given these facts, what generally carries deoxygenated blood among the following options: - blood vessels - animals - layers of fat - mammals - critical organs - an organism's body - elephants - athletes
blood vessels