The Northern Hemisphere is warmer in spring than in winter, because in spring

A) the days are shorter.

B) it gets more direct sunlight.

C) the Earth is closer to the Sun.

D) it is tilted away from the Sun.

Re to maintain the homeostasis of blood pH can affect the activity of a) enzymes that clot blood. b) red blood cells that make antibodies. c) chlorophyll that carries oxygen in the blood. d) DNA that controls starch digestion in the blood.

Which type of immunity is involved in the formation of antibodies and specific lymphocytes after exposure to an antigen? a. cell-mediated b. adaptive c. natural?

What must viruses do before they can reproduce?

How has deforestation impacted the environment of Africa

Tissues are groups of similar cells working together to:

Which of the following describes a relationship of commensalism? A. Oxpecker birds eat parasitic ticks off the backs of zebras B. The tapeworm latches itself in the intestines of a rat feeding off all the nutrients eaten by the rat C.

A substance directly involved in cellular communication within the human body

Scientists try to predict the location of major earthquakes based on which of the following? location of fault zones location of a mountain location of an ocean location of the science lab

What Are The Branches Of Botany?

Rocks, temperature, and water ARE what part of the environment