Q: The frequency of sound waves is measured in what unit? Read this paragraph and choose the correct option from the provided answers: The frequency of sound waves is measured in hertz (Hz), or the number of waves that pass a fixed point in a second. Human beings can normally hear sounds with a frequency between about 20 Hz and 20,000 Hz. Sounds with frequencies below 20 hertz are called infrasound . Infrasound is too low-pitched for humans to hear. Sounds with frequencies above 20,000 hertz are called ultrasound . Ultrasound is too high-pitched for humans to hear. Choices: - watt - rads - decibel - hertz A:
hertz

(Question)
Q: Overharvesting is a serious threat particularly to which species? Read this paragraph and choose the correct option from the provided answers: Overharvesting Overharvesting is a serious threat to many species, but particularly to aquatic species. There are many examples of regulated fisheries (including hunting of marine mammals and harvesting of crustaceans and other species) monitored by fisheries. Choices: - aerial species - amphibious species - terrestrial species - aquatic species A:
(Answer)
aquatic species

Ques: Q: An atom that gains or loses electrons is called what? Read this paragraph and choose the correct option from the provided answers: An atom that gains or loses electrons is an ion. Choices: - photon - quark - isotope - ion A:
Ans: ion

(Q).
Q: What is the term for a symbiotic relationship in which the parasite benefits while the host is harmed? Read this paragraph and choose the correct option from the provided answers: Parasitism is a symbiotic relationship in which one species (the parasite ) benefits while the other species (the host ) is harmed. Many species of animals are parasites, at least during some stage of their life. Most species are also hosts to one or more parasites. Choices: - infection - reciprocity - pathology - parasitism A:
(A).
parasitism

Ques:Q: Excretory organs that conserve what essential substance help terrestrial animals to avoid desiccation? Read this paragraph and choose the correct option from the provided answers: Choices: - metabolytes - air - food - water A:

Ans:water

Ques:Q: The diapsids diverged into two groups, the archosauromorpha ("ancient lizard form") and the lepidosauromorpha ("scaly lizard form") during what time period? Read this paragraph and choose the correct option from the provided answers: The diapsids diverged into two groups, the Archosauromorpha ("ancient lizard form") and the Lepidosauromorpha ("scaly lizard form") during the Mesozoic period (Figure 29.22). The lepidosaurs include modern lizards, snakes, and tuataras. The archosaurs include modern crocodiles and alligators, and the extinct pterosaurs ("winged lizard") and dinosaurs ("terrible lizard"). Clade Dinosauria includes birds, which evolved from a branch of dinosaurs. Choices: - holocene - cenozoic - paleozoic - mesozoic A:

Ans:
mesozoic