What is the smallest unit that can carry out the basic functions of life?

Which example represents a tissue?

The stomach belongs to which level of biological organization?

The stomach and intestines work together to digest food. Which level do they form?

Which statement correctly explains how levels 2 and 3 in the diagram are related?

During an outdoor activity, Paolo records one mango tree. Which ecological level does this single tree represent?

All the tilapia of one species living in a pond belong to which ecological level?

Rice plants, frogs, and insects live and interact in one field. What level includes these living groups together?

A study includes a lake's fish, algae, water, sunlight, and their interactions. Which level is being studied?

Which level includes every region of Earth where life exists?

Which field studies relationships among living things and their surroundings?

Which pair contains only abiotic components of a rice-field ecosystem?

Which sequence moves from one living individual toward larger ecological groupings?

For a food chain beginning with green plants, where does its energy originally come from?

Which process makes green plants producers at the base of an energy pyramid?

Some bacteria make food using energy from chemical reactions rather than light. Which process do they use?

A caterpillar feeds only on leaves. Which feeding level does it occupy?

An animal eats other animals but does not eat plants. How is it classified?

Fungi release nutrients as they break down fallen leaves. What role do they play?

If detritivores disappeared from a forest, which change would be most likely?

Which observation most strongly supports using a food web rather than one food chain?

In this food web, which organism is a secondary consumer in every feeding route shown to it?

In this food web, which consumer levels does the snake occupy when eating a rat and when eating a frog, respectively?

Which group has the greatest energy supply in this pyramid?

Why is less energy available at higher feeding levels?

Which comparison best tests whether light affects food production in rice seedlings?

Forest clearing reduces prey in a Philippine eagle's territory. If prey remains scarce, what is the likely long-term effect?

Which description defines a force?

Lira presses a lump of clay between her palms. Which property is most likely to change?

A ball rebounds from a wall at the same speed. Which aspect of its motion did the wall's force change?

After a ball leaves a table, what pulls it toward Earth?

A wooden block hangs from a taut string. Which force does the string exert on the block?

What force resists a wooden block sliding across a rough, horizontal tabletop?

A book rests on a horizontal table. The diagram shows forces acting on the book. What does arrow A represent?

A plastic comb rubbed with cloth attracts small paper scraps without touching them. Which force causes this attraction?

Which pair of interactions involves only non-contact forces?

Which upward force from the water helps support this floating boat?

What is the SI unit used to express force?

What force reading does this instrument show?

Which spring-balance procedure measures sliding friction on a block on a level table?