Why must the heart contract very strongly to pump blood from the left ventricle into the aorta?

The upper part of graft combination is called ...

A scientist recently discovered a pond organism that is unicellular, contains chloroplasts and other membrane-bound organelles, and has a flagellum. in which kingdom is this organism classified?

Which type of diversity refers to the amount of variation in the gene pool of a species

True or False. Osmosis is an active process of the cell.

Which of these is an example of mutualism? A - Cattle egret eats the exposed insects as the cattle graze B - Honeybee pollinates a flower while gathering nectar C - Tick gains nourishment by sucking blood from a dog D - Two bucks fight to gain

What are delusions? what are some symptoms?

What happens to Earth when it is farthest from the sun? It moves fastest. It stops rotating. It moves slowest. It stops revolving.

What are two different habitats in a prairie ecosystem and name one organism found in each habitat.

Which level on the energy pyramid has the third most energy? A. primary producers B. primary consumers C. secondary consumers D. tertiary consumers

How do pH affect the stability of double-stranded nucleic acid?