Which event signals the brain to breathe? increased blood levels of oxygenincreased blood levels of carbon dioxidecontraction of the diaphragmrelaxing of the diaphragm

1. isogamy 1 organisms with gametes of the same size and shape 2. anisogamy organisms with gametes of different sizes and shapes 3. oogamy 2 organisms with gametes of the same shape but different sizes 4. gonads gamete-producing organs in lower plants 5. gametangia gamete-producing organs in animals

Which fossil organism in whale evolution do you think was the first to live mostly in water? explain your claim with evidence and reasoning?

Conservationists to restore ecosystems. which activity will positively affect the abiotic conditions of an ecosystem?