Which organelle can be compared to a security guard who decides whom may enter a building and whom may not?

O cell membrane

O cytoplasm

O endoplasmic reticulum

O mitochondrion

in this phylogenetic tree, which two organisms on the tree would be expected to share the most characteristics

What is an arid land?

Which of the following terms correctly describes DNA replication? A) bidirectional B) semiconservative C) semidiscontinuous D) A and B E) all of the above

Condition achieved when molecules are evenly spread in an area

What is the primary source of energy for food chains in an ecosystem? decomposers producers consumers the sun

In water, what happens to a base? It forms hydrogen ions (H + ). It condensates. It evaporates. It forms hydroxide ions (OH-).

two unknown Pea plants are crossed. 75% for 3/4 of the plants have axial flowers and 25% or 1/4 have terminal flowers. what are the genotypes of the parents?

Explain why limestone that began as coral can be found on land.

Felicity's ldl cholesterol level is too high. to lower her cholesterol level, she took large doses of a certain vitamin supplement, but she experienced severe facial flushing and liver damage as a result.

Igneous rocks were the first rock type to appear on Earth.