Why are there more species of plants there now than were planted? (multiple choice)

Human activity

Seed dispersal

Extinction

Spore transport

Sponges (phylum: porifera) are animals that possess feeding cells called collar cells. these cells have a central flagellum surrounded by a collar of microvilli. the collar filters organic matter out of the water column.

Refractor telescope uses a mirror to gather light. a. True b. False

What condition is a result of using an anaerobic digester

Why doesn't temperature change uniformally with altitude

Through which tissue do sugars get transported to reach the leaves during growth and reproduction? collenchyma parenchyma xylem phloem

Since mature red blood cells do not contain a nucleus, more room is available for what?

What does a cladogram show about organisms?

What is the most efficient enzyme known that can catalyze hydrogen?

The process where sediments turn into a sedimentary rock through compaction or cementation is called

Muscles in animals are often found in pairs, because A. muscles need to be able to both push and pull. B. muscles can only push. C. muscles can only produce a force as they relax. D. muscles can only pull.