Blood cells are made in which system?

a. skeletal system

b. circulatory system

c. muscular system

d. nervous system

Humans can see the star Polaris from Earth. It appears to move during different times of the year. Explain why Polaris appears to move.

Archaea and eubacteria are prokaryotic in nature. One of the differentiating characteristics between them is that eubacteria have peptidoglycan chitin cilia chloroplasts in their cell walls.

What is the electron called if it's dead?

What important characteristics unique to land plants are thought to be critical evolutionary advances that contributed to their success on land? Select all that apply. stomata cuticle O vacuoles chlorophylls a and b xylem

Which characteristics makes a cell membrane selectively preamble

Which is produced immediately after a plant sperm cell fertilizes an egg cell? a. a zygote b. plant nutrients c. sweet nectar d. a spore

In modern classification system, unicellular organisms that contain chloroplasts and a nucleus would be considered; A) annelids B) protists C) archaea D) chordates

The northern copperhead is Agkistrodon contortrix contortrix, the southern copperhead is Agkistrodon contortrix mokasen, and the cottonmouth is Agkistrodon piscivorous. Therefore, A. all are subspecies of Agkistrodon. B.

What's a primary consumer

After plants absorb energy from the sun the energy gets converted into blank energy for the plant to carry out life activities