Population density is the average number of individuals per unit of area or volume, and economy is affected by population size and density. Given these facts, what is affected by the average number of individuals per unit of area or volume among the following options: - goats - economy - cows - animals - vegetation - mammals - bushes - wind
economy

(Question)
Astronauts require preserved food for extended flights, and astronauts travel into space aboard space shuttles. Given these facts, space shuttle travelers require what food for extended flights among the following options: - layers of fat - short-lived - nutrients - perishable - preserved - little - Proteins - Dehydration
(Answer)
preserved

Ques: Chordates have a complete digestive system and a closed circulatory system, and vertebrates are members of of a larger group, the chordates . Given these facts, vertebrates have a complete digestive system and a what among the following options: - Veins and arteries. - lack of backbone - bruised brain stem - critical organs - closed circulatory system - incomplete circulatory system - characteristics - sensory neurons
Ans: closed circulatory system

(Q).
Matter vibrating can cause sound, and when the waves pass our ears, a sound is detected. Given these facts, what can our ears detect among the following options: - extremely high frequencies - matter vibrating - population movement - extremely high-pitched sound - electromagnetic energy - matter's height - sensory neurons - rays or beams
(A).
matter vibrating

Ques:Condensation is when change from a gas into a liquid by reducing heat energy, and condensation is the reverse of vaporization , or change from liquid to gas. Given these facts, what happens when there is an increase in heat energy among the following options: - Evaporation - hyperthyroidism - vaporization - Firecrackers - global warming - electricity - sweating - motion

Ans:vaporization

Ques:Heterotrophs are living things that cannot make their own food, and proteins are an essential nutrient for heterotrophs . Given these facts, what do things that cannot make their own food need as a nutrient among the following options: - Energy - metal - animals - mud - Energy. - protein - prototype - fungi

Ans:
protein