Which cell structures are present in mature sieve tube cells, but not in mature vessel elements? Select all that apply. smooth endoplasmic reticulum nucleus mitochondria cytoplasm cell wall

Give example of two different species might complete for same prey

According to darwin's theory of evolution, differences between species may be the result of

You have just learned that a chemical you work with is a mutagen. what effect does this chemical have?

The planets in our solar system are measured in light years, have circular orbits

The ___ are thin-walled blood vessels that exchange materials through their walls. A. Arteries B. Arterioles C. Capilleries D. Venules

Select the kingdoms where all prokaryotes are classified. Archaea Animalia Eubacteria Plantae Fungi Protista Multi choice

The fight-or-flight reaction occurs during which stage of gas?

The gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is dominant to terminal, list all of the possible F1 and F2 genotypes and phenotypes from a cross involving parents that are homozygous for each trait.

What role does gravity play in mass movement

Why don't all plants have chloroplasts?