Human reproduction usually involves

(1) internal fertilization and internal development

(2) external fertilization and external development

(3) internal fertilization and external development

(4) external fertilization and internal development

Jeremy is sitting quietly when the muscles in his left leg begin to "twitch." this activation of movement in his voluntary muscles is most likely due to the release of the neurotransmitter

Smallest to greatest biome, community, ecosystems, biome, habitat and biosphere

In substituted hydrocarbons that contain halogens what atoms have been replaced by halogen atoms

Energy is released to be used by a cell when a phosphate group is removed from ADP to form ATP added to ADP to form ATP removed from ATP to form ADP added to ATP to form ADP

I'm the human body which system function is detecting and responding to stimuli? A. Nervous B. Endocrine C. Circulatory D. Muscular.

Distinguish between cell differentiation and cell specialisation

What amount of earths total water supply is usable fresh water? A. 25% B. Less than 1% C. 50% D. 75%

What Kingdom do euglena belong to? What Phylum?

Which of these would NOT be an effective way to represent data collected in a scientific experiment? A) data table showing months of the year and average temperatures B) line graph with time on the x-axis and plant growth on the y-axis C) bar graph

Why do humans have two sets of 23 chromosomes