When might ethical considerations prevent experiments from being conducted? Explain

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Diffusion and osmosis are forms of passive transport

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons