Which of these events is an example of a primary disturbance in an ecosystem?

A. A landslide

B. A falling tree

C. An avalanche

D. A forest fire

Darlene melted a stick of butter and set the liquid butter on the counter. After a few hours, Darlene saw that the butter had become solid again. What happened to cause the liquid butter to turn back into a solid?

A population of mammals originally lived in a certain area surrounded by land then some of the organisms were taken to an island these two populations remain separated for hundreds of years

Explain how enzymes activity is affected by the PH and concentration of the substrate?

What does a seed contain? embryo and nutrients nutrients and vascular tissue vascular tissue and pollen pollen and nutrients

According to fossil records, the horses that lived 50 million years ago were much smaller, weaker and slower than modern horses.

Which of the following statements is true A you get you acquired traits all your life but once you acquire them they never change B you are born when inherited traits but they change over your lifetime as you learn new things C your inherited traits

What initiates the contraction of cardiac muscle?

1. If the sequence on a DNA molecule was CCTAG, the complementary sequence on the mRNA would be: GGAUC GGUTC GGATC UUATU

Adrienne has a pet mollusk. Lately she noticed that her pet has learned how to escape its tank. What kind of mollusk is Adrienne's pet? What makes you believe this?

What math skill do scientists use